Geochemical
and Petrographic Studies on The Granitoids of the Kumarkunti-Jharnomal
Area, Nuapara District, Orissa: A Potential Source for Rare Metal
and Rare Earth Minerals
K.S.Mishra,
M.K.Rao, G.N.Hegde, S.K.Saxena, and A.K.Bagchi
Implication
of Disequilibrium in Uranium Series on its Geochemical Association
- A Case Study for Ferruginous Carbon Phyllite from Kantaldih Area,
West Singhbhum District, Jharkhand
B.Sreenivasa
Murthy, A.A.P.S.R.Acharyulu, Satyendra Kumar and B.K.Bhaumik
Radioelemental
Characterisation of Neoproterozoic South Khasi Batholith and Mylliem
Granite Pluton by Portable Gamma ray Spectrometry: Its Implication
on Uranium Exploration in Parts of East and West Khasi Hills, Meghalaya
H.S.Rajaraman,
R.Timothy, L.K.Nanda, S.Q.Hoda and S.N.Kak
Fe-U-Th-REE
MINERALIZATION IN PROTEROZOIC BRECCIA
AT MANUPATULAGADDA-MALLAMPALLI AREA, PAKHAL BASIN,
DISTRICT WARANGAL, ANDHRA PRADESH
Bikash
Sengupta, S. Niranjan Kumar and I.V.Sastry
Atomic Minerals
Directorate for Exploration and Research, Hyderabad
Abstract
The iron oxide breccia hosted (Fe-U-Th-REE)
type mineralisation associated with middle Proterozoic sediments is
located between Manupatulagadda and Mallampalli area of district Warangal
in Pakhal basin intermittently over nearly 25 km long NNW-SSE trending
linear belt. This mineralisation occurs predominantly in brecciated
quartzite of Mallampalli Group of Pakhal Supergroup.
The U-Th-REE mineralisation in ferruginous-brecciated Bayaram quartzites
of the Pakhal Super Group has all features of the Iron breccia type
mineralisation quite akin to Bayan Obo, Nb-REE deposit of China.
The brecciated Bayaram quartzites of the intercratonic Pakhal
basin are
high in iron content. The quartzites are predominantly composed of
mono and poly crystalline quartz along with chert, sericite and clay.
Fe is contributed by goethite and hematite, whereas Th and REE are
predominantly contributed by monazite. The uranium is associated
primarily with Fe hydroxides and leucoxene besides minor amount
in monazite and
zircon. The partial major element chemistry of the brecciated quartzite
shows high Fe content (av. 22%Fe2O3)
with good concentration of Ti (av. 3.34%TiO2)
and P (av. 2.69% P2O5).
The REE distribution in the quartzites shows major LREE component
(av.1.49%) making up nearly
97% of total REE content (av.1.5%). The chemical analysis of quartzites
has indicated uranium concentration of 0.022 % U3O8 and
0.31% ThO2.The
sediments of Pakhal Group have witnessed uplift, faulting, deformation
and influx of iron distinctive of Proterozoic environment, inspite
of lack of evidence for rifting.
THE
OCCURRENCE OF U-Cu–Au MINERALISATION IN KHOKHRI
BAIRATH AREA, DISTRICT JAIPUR, RAJASTHAN, INDIA
S.N.
Saini and M.K. Khandelwal
Atomic
Minerals Directorate for Exploration and Research
Pratap Nagar,
Jaipur
Abstract
Several old workings for copper
have been found in the vicinity of Khokhri Pahadi of the Bairath Plateau
of Jaipur district, Rajasthan, which comprises Bairath granite and
Meso-Proterozoic metamorphosed volcano-sedimentary rocks of Delhi Supergroup.
These copper workings lie within shear zones, represented by ferruginous
siliceous breccia. Presence of anomalous gold (39-641 ppb), uranium
(0.021 to 0.134%U3O8),
copper (452-11212 ppm) and cobalt (75 to 512 ppm) has been recorded
in 5 channel samples taken from the Khokhri
shear zone (440 X 2-12m). The shear zones trending NW -SE to E-W are
considered to have developed during early phase of deformation of Bairath
granite and metasediments. The geological characteristics of the mineralized
zones are characteristic of the shear controlled type deposits.
Key words : Uranium-copper- gold mineralisation, Khokhri- Bairath,
Rajasthan.
URANIUM
MINERALISATION IN MESOPROTEROZOIC METAMORPHITES OF DERI-AMBAJI AREA,
SIROHI DISTRICT,
RAJASTHAN AND BANASKANTHA DISTRICT, GUJARAT
K.K.
Pandey1, *P.K. Shrivastava, M. Sai Baba2 and *K.K. Dwivedy
Atomic Minerals
Directorate for Exploration and Research 1 Nagpur,2 Hyderabad
Abstract
Uranium mineralisation associated
with base metal sulphides hosted in Mesoproterozoic metamorphites of
Ajabgarh Group of the Delhi Supergroup occurs in the Deri - Ambaji
area, which forms extreme southwestern extension of the Aravalli -
Delhi fold belt. The Aravalli - Delhi stratigraphy is known to host
economically viable polymetallic occurrences of Cu, Pb, and Zn along
the western flank of NE-SW trending Aravalli range.
The uranium mineralisation in the form of pitchblende and coffinite
besides some secondary uranium mineral (hydroxide of uranium, barium & calcium,
as identified by XRD) is recorded in the radioactive hornblende-actinolite-chlorite
schist and biotite- chlorite schist. Primary uranium minerals and secondary
uranyl minerals occur sporadically but confined to the major foliation
of the host rocks.
Most of the radioactive samples drawn from a level drive developed
60 m vertically below the surface in the underground Deri base metal
mines have recorded 0.12 to 0.038% U3O8 (???),
upto 0.046% U3O8(chemical)
and <0.008% ThO2.
Significant Au and Ag values ranging from 50ppb to 1268ppb and 5ppm
to 62ppm respectively have also been recorded in
the rocks hosting uranium mineralisation.
Key words : Uranium mineralisation, Deri - Ambaji, Rajasthan and
Gujarat.
XENOTIME
PLACERS AS RESOURCES OF REE IN DEO RIVER,
KOLEBIRA, SIMDEGA DISTRICT, JHARKHAND
Sanjay
Bagora1, K.S.Mishra1, A.K.Singh2 and P.V. Ramesh Babu3
Atomic Minerals
Directorate for Exploration and Research 1 Central Region, Nagpur.2 Northern
Region, New Delhi 3 Eastern Region, Jamshedpur
Abstract
Deo river drains in the southern
parts of the Chhotanagpur Plateau, which comprises Archaean-Proterozoic
granitoids. The riverine placers of this river have been recognised
as source of xenotime (a phosphate of yttrium and HREE), besides monazite,
zircon and minor columbite-tantalite.
Xenotime-bearing riverine placers occur as island, flood plain
and side bar along 11.75 km stretch of easterly flowing and
mildly meandering
Deo River, with a channel width of 50m to 150m. Systematic grid sampling
was carried out in 232 sand bars using 6400 auger holes in a grid
pattern (10x2m) up to one meter depth. Heavy minerals data
indicate two different
concentrate layers with 0.22 to 4.85 % (upper 50 cm layer), 0.08
to 3.45% (lower 50cm layer), of polymineralic concentrate comprising
mainly
ilmenite, magnetite, xenotime, monazite and zircon. Analysis of heavy
mineral concentrate indicate xenotime concentration of 3.5 to 4.5
% by weight on average with wide variation in size fraction
of -30# to
+120#. Analyses of polymineralic concentrate has indicated 1.24-2.81%
Y2O3 and
5.74-12.81 % Ce2O3 (n=428).
Key words: Xenotime, Riverine placers, Deo river, Jharkhand.
URANIUM
MINERALISATION IN PROTEROZOIC GULCHERU QUARTZITE,
WEST OF PAPAGHNI RIVER, CUDDAPAH DISTRICT, ANDHRA PRADESH
U.P.
Sharma1, A.K. Rai1 and Anjan Chaki2
Atomic Minerals
Directorate for Exploration and Research 1Nagarabhavi, Bangalore-560 072, 2Hyderabad-500
016
Abstract
Uranium mineralisation in Gulcheru
quartzite occurs over a 35 km long belt, between west of Gandi and
Kannampalle (west of Papaghni river), along southwestern margin of
Cuddapah basin. Radioactive samples (n=220), collected from 56 anomalies,
have assayed 0.010% to 2.952% eU3O8 and
0.010% to 2.112% U3O8 with
negligible thorium. Host rock is fractured, brecciated and has a lot
of chloritic material in it. The radioactivity is due to pitchblende,
uraninite, coffinite, brannerite, U-Ti complex and secondary uranium
minerals. Secondary uranium minerals (SUM) occur as yellow and green
encrustations along the weak planes. The associated other ore minerals
include specular hematite, chalcopyrite, pyrite, arsenopyrite, galena,
molybdenite, limonite and goethite. XRD data of radioactive quartzite
also confirm the presence of uraninite, along with SUM, i.e., uranophane,
boltwoodite, weeksite and hydrogen autunite. Petrological studies display
alteration of pitchblende into SUM, and that of hematite into goethite
and limonite. Uranium mineralisation occurs along fault planes, fractures,
joints and grain boundaries of clasts, which suggest structural control
of mineralisation in quartzites. Uranium mineralisation in siltstone
is associated with ferruginous material in adsorbed form. Anomalous
contents of Mo (x =258 ppm), Pb (x = 2020 ppm), Ni (x = 52ppm), Co
(x = 30 ppm), Cu (x = 147ppm), Au (0.25 to 13 ppm) and Ag (0.25 to
8 ppm) in mineralized quartzites point out that uranium mineralizing
hydrotherms were derived from a mixed source, possibly from schist
belt and basement granite.
Key words : Uranium mineralisation, Gulcheru quartzite, Andhra
Pradesh.
SULPHUR
ISOTOPIC STUDY ON CHALCOPYRITE FROM SANKADIH, WESTERN SINGHBHUM SHEAR ZONE, JHARKHAND, INDIA
Shailendra
Kumar1, S.J. Chauhan2, *K.R. Gupta and *A.K. Bagchi
Atomic
Minerals Directorate for Exploration and Research,
Department of Atomic Energy 1New Delhi-110 067, 2Bangalore-560
072.
Abstract
Chalcopyrite separated from uraniferous
chlorite quartz schist from Sankadih
(22o46’22":
85o46’5”,
73 F/13), western part of Singhbhum Shear Zone (SSZ), Bihar has 34S
values that ranges from +0.9 to +3.4
‰ (per mil). The range of 34S values of chalcopyrite points to sulphur
of magmatic hydrothermal origin or modified due to metamorphic recrystallisation.
The geological setting and petromineralogical character of host rock
supports that interpretation.
Key words : Sulphur isotope, Chalcopyrite, Singhbhum, Jharkhand.
URANIUM
MINERALISATION IN KHETRI-KOLIHAN MINES,
JHUNJHUNU DISTRICT, RAJASTHAN
Prakhar
Kumar1,
B.C. Sarkar1, R. Mohanty2,
*A. K. Pande and *K. R. Gupta
Atomic Minerals
Directorate for Exploration and Research
Department of Atomic Energy 1Jaipur-303906, 2Shillong-793011.
Abstract
Uranium
mineralisation in amphibole-quartzite, biotite-chlorite schist and
calc-silicate rocks at the contact of Alwar
and Ajabgarh metasediments of Delhi Supergroup, was recorded in Khetri
and Kolihan copper mines of Khetri Copper Belt. Grab samples have assayed
0.013 to 0.62% U3O8 (???)
with < 0.01% ThO2.
Uraninite and brannerite are the main uranium minerals. The uraniferous
zone occurs to the footwall
side of copper lode. A hot spring is also present in the uraniferous
zone. The mineralisation is epigenetic and hydrothermal in origin.
Key words: Uranium mineralisation, Khetri-Kolihan copper mines, Rajasthan,
India.
GEOCHEMICAL
AND PETROGRAPHIC STUDIES ON THE GRANITOIDS OF THE KUMARKUNTI-JHARNOMAL
AREA, NUAPARA DISTRICT, ORISSA: A POTENTIAL SOURCE FOR RARE METAL
AND RARE EARTH MINERALS
Atomic Minerals
Directorate for Exploration and Research, 1Nagpur 440001,2Hyderabad
500016,3Bangalore
560073.
Abstract
The
granitoids represented by zircon-granite, porphyritic alkaline granite,
riebeckite granite, adamallite and syenite
around the Kumarkunti-Jharnomal area, occur in a linear N-S trend along
the eastern faulted contact of the Khariar-Nuapara outlier. The major
element chemistry shows a rising trend in SiO2,
Al2O3,
Na2O,
while a falling trend is noted in case of MgO and FeO with respect
to differentiation
index. They are metaluminous to peraluminous in nature with A/CNK values
ranging from 0.31 to 2.68 (av. 1.65). The agpaitic index (mol Na2O+K2O/Al2O3)
is <1 (0.30 to 0.34) indicating its subalkaline nature.
Geochemical study of the granitoids indicates anomalous concentration
of the elements like Y (120-1231 ppm), Nb (72-7350 ppm), Ta (86-526
ppm), La (129-1757 ppm), Ce (453-1876 ppm), Sn (15-273 ppm), U (42-262
ppm), Th (0.1-4%), Zr (0.4-6.2%) along with Rb (179-553 ppm). The petromineralogical
studies indicate that the anomalous concentration of trace elements
is mainly due to the presence of thorite, allanite, fersmite and zircon.
Geochemical signatures such as Ga 9 to 58 ppm , very high ratios of
Rb/Sr, Fe2O3/FeO
and strong depletion in Ba and Sr, along with a rather low Ca and
Mg, point to its A-type character. Various discrimination
diagrams reveal the origin of these granites under within plate tectonic
setting.
CHARACTERISATION
OF URANIUM MINERALISATION IN MIDDLE PROTEROZOIC ABUJHMAR BASIN, BASTAR
DISTRICT, CHHATISGARH
S.N.Chaturvedi,
*V.P. Saxena, *Mir Azam Ali* and *D.C. Banerjee
Atomic Minerals
Directorate for Exploration and Research
Department of Atomic Energy
Nagpur – 440001
Abstract
Middle Proterozoic intracratonic
Abujhmar Basin forms the northwestern part of Bastar Craton. Volcanosedimentary
sequence of Abujhmar Group unconformably overlies the rocks of Bengpal
Group in the southern part, Nandgaon Group in the northern part and
Dongargarh Granite in the western part. Lineaments such as Bodhghat
(NW-SE), Kotri (NNE-SSW), Raoghat (WNW-ESE), Mundatikra (WNW-ESE) and
other faults have played major role for disposition of the rocks in
and around Abujhmar Basin. The sediments of Abujhmar Basin derived
from basement granites, Bailadila iron ore, Nandgaon sandstones / rhyolites
and Dongargarh granites have been deposited in a fluviatile to shallow
marine environment with Gundul Formation forming the basal unit.
Uranium mineralisation in the Gundul Formation of Abujhmar Group
is essentially strata bound type and unconformity proximal
type. The Upper
Gundul sandstone shows profuse development of secondary uranium mineralisation
in the central part of the basin near Kerali and Saragipal, indicating
strata bound character of the mineralisation. In the northeastern
margin along Bogan-Gundul tract, uranium concentration is observed
in the
lower units, close to the unconformity. Near Kotri lineament (Waler
area), the pyritiferous greyish green arkosic sandstone, immediately
overlying the conglomerate, also shows significant uranium anomalies.
Although the uranium occurrences at Bogan and Waler are apparently
strata bound, the influence of structure and their proximity to the
basic sills, dykes, flows and proximal placement to the unconformity
are noteworthy. Considering the different favourability criteria
and wide spread occurrence of uranium anomalies all over the
basin, particularly
along the margins, in addition to the strata bound sandstone type,
unconformity related type uranium concentration of economic significance
could also be expected in Middle Proterozoic Abujhmar basin.
Key words : Uranium Mineralisation, Abujhmar basin, Bastar, Chhattisgarh.
URANIUM
LEACHABILITY STUDIES ON SMOKY QUARTZ SAMPLES OF PIPARPAN AREA, SURGUJA DISTRICT, CHHATTISGARH
K.
Raja Gopal 1, V.J. Katti 2, *V.N. Sah, G.V.S.U.
Rao1
T.P. Singh1 and *V.P. Saxena
Atomic
Minerals Directorate for Exploration & Research
Department of Atomic Energy 1 Nagpur 440 001, 2 Jaipur
303 906
Abstract
Radiometric survey in northern part
of Surguja district of Chhattisgarh, resulted in location of uranium
anomalies in migmatites of Piparpan sector. Hydrometallurgical studies
were undertaken on the samples from this area for uranium leaching.
Uraninite is the main uranium mineral, while other radioactive minerals
present include soddyte, coffinite, thorite and uranothorite. Pyrite,
chalcopyrite, arsenopyrite and galena were identified as other common
ore minerals. The U3O8 content
(chemical) of the three samples studied are 0.042%, 0.065%, 0.270%.
Percolation leaching on feed crushed to
6mm size has shown around 50% U3O8 leachabilitity
with 9.36 kg/ H2SO4 acid
and 2.0kg/T MnO2 oxidant
consumptions, indicating possibility of heap leaching route for recovery
of uranium. Leachability exceeding
90% has been obtained in all three samples by hot agitation leaching
at temperature 45 – 500oC
with 11 kg/T H2SO4 acid
and 2.0kg/T MnO2 oxidant
consumption, indicating the uranium contained in the smoky quartz of
this area is easily leachable irrespective of the feed grade.
Key words : Uranium leachability, Smoky quartz, Surguja, Chhattisgarh.
IMPLICATION
OF DISEQUILIBRIUM IN URANIUM SERIES ON ITS GEOCHEMICAL ASSOCIATION – A CASE STUDY FOR FERRUGINOUS CARBON PHYLLITE FROM KANTALDIH
AREA, WEST SINGHBHUM DISTRICT, JHARKHAND
B.
Sreenivasa Murty1,
A.A.P.S.R. Acharyulu2,
Satyendra Kumar1 and
B.K. Bhaumik3
Atomic Minerals
Directorate for Exploration and Research
Department of Atomic Energy 1Jamshedpur, 2Hyderabad,
3New
Delhi
Abstract
Uranium in a geological environment
may behave like an open system. Migration of uranium radioisotopes
is very common. Broadly, uranium group and radium group in U – series
do not tend to remain in equilibrium. In a deposit it is desirable
that uranium group should be present. It is well known that this group
contributes alpha and beta activity, whereas radium group contributes
to alpha, beta and gamma activity. Counting for total beta and gamma
emission (both total and differential) from terrestrial specimen provides
a way to estimate both the concentrations of actual uranium (expressed
by %U3O8)
and radium equivalent part of it [expressed by %Ra (eU3O8)].
The ratio (fd) between %U3O8 and
%Ra(eU3O8)
is found to be a suitable index for showing the degree of disequilibrium.
Some of the ferruginous carbon phyllite samples collected from Kantaldih and
Kolidih area are showing uranium concentration with significant disequilibrium
in favour of parent. Based on the correlation between %U3O8 and
%Ra(eU3O8),
the samples were divided into two groups, one in equilibrium and the other
in disequilibrium
in favour of parent. Correlation matrix provides the relation of uranium with
trace elements for these two groups.
In the first group (G-I), where the uranium series is in equilibrium, uranium
is positively correlated with Co, Ni, Cu, and Y (i.e., with sulphides and phosphates)
and negatively correlated with Ti, Ga, Zr and Pb. This shows Ti, Ga and Zr seem
to be the contribution from placer material. Pb may be related to base metal
mineralization. In the second group (G-II), where disequilibrium in uranium series
exists, uranium appears to be independent of Co, Ni, Ga, Y, Zr and Pb and shows
strong negative correlation with titanium and vanadium. It shows positive correlation
only with Cu (r = 0.56). The G-II has relatively higher average concentration
of uranium (552 ppm), than the G-I that has 276 ppm as the average uranium content.
A
NOTE ON THE OCCURRENCE OF URANIUM IN GONDWANA CONGLOMERATE NEAR
ALLAPAKONTA AND VEMBAKAM, CHITTOOR DISTRICT, ANDHRA PRADESH, INDIA
U.P.
Sharma1, K. Umamaheswar2 and Himadri Basu2
Atomic Minerals
Directorate for Exploration and Research 1Nagpur-440001, 2Hyderabad-500
016.
Abstract
This
note presents the first account of uranium occurrence (250m x 2-3m
) in conglomerate at the base of Satyavedu Formation of Upper Gondwana
sediments of Palar Basin, near Allapakonta and Vembakam, Chittoor
district, Andhra Pradesh. Grab samples (n=7) have analysed 38 ppm
to 218 ppm eU3O8, 32 ppm to 232 ppm U3O8 with negligible thorium.
Radioactivity in conglomerate is associated with chlorite, zircon
and ferruginous material (limonite).
Key words : Uranium, Conglomerate, Chittoor, Andhra Pradesh.
RADIOELEMENTAL
CHARACTERIZATION OF NEOPROTEROZOIC
SOUTH KHASI BATHOLITH AND MYLLIEM GRANITE PLUTON BY PORTABLE GAMMA-RAY
SPECTROMETRY: ITS IMPLICATION ON URANIUM EXPLORATION IN PARTS OF EAST AND WEST KHASI HILLS, MEGHALAYA
H.S.Rajaraman1,
R.Timothy2, L.K.Nanda3, *S.Q.Hoda and *S.N.Kak
Atomic Minerals
Directorate for Exploration and Research 1 Hyderabad 500 016, 2 Shillong
793 011, 3 Jaipur
302 030.
Abstract
Younger granite activity in the form of South Khasi Batholith (SKB),
Kyrdem, Mylliem and Nongpoh plutons occur as intrusive into the basement
gneissic complex and Paleo-Mesoproterozoic Shillong group of rocks.
Ground portable gamma ray spectrometric survey carried out over the
SKB, the Mylliem pluton and the basement gneissic complex. The eTh,
eTh/eU and K contours clearly demarcate their lithocontacts. Radiometrically,
these plutons are of hyperacidic to alkaline in nature. The magmatic
evolution and the differentiated origin of granites are reflected
by high concentration of eTh and K. The low Th/K values within the
pluton indicate presence of diorite bodies and also suggest K enrichment
along the margin of the Mylliem pluton. Higher concentration of radioelements
along the margin of Mylliem pluton may be due to the role of hydrothermal
phase to transport the radioelements. The high eTh/eU values and
uranium favourability index of the SKB may imply possible loss of
considerable amount of uranium to become provenance for the nearby
uranium districts.
Key words : Radio elemental distribution, Granitoids, Meghalaya.
PETROMINERALOGICAL
CHARACTERIZATION OF URANIFEROUS GRANITES OF DARIPARA AREA, DISTRICT SURGUJA, CHHATTISGARH
N.
Ranganath1, R.V.S. Sesha Rao1 and *V.P. Saxena
Atomic Minerals
Directorate for Exploration and Research,
Department of Atomic Energy 1Nagpur – 440 001.
Abstract
Daripara radioactive granites are
characterized by two generations of biotite and microcline. The granite
displays shear effects in the form of bending of biotite flakes and
twin lamellae of feldapars, undulose extinction of quartz, grain boundary
granulation and mylonitisation. Uraninite, brannerite and uranophane
have been identified as uranium minerals. Presence of brannerite and
uraninite as inclusions in gangue minerals indicate magmatic source
for protore uranium, which has been subsequently mobilized and concentrated
along shear zone by hydrothermal and supergene processes.
Key words : Uraniferous granites, Surguja, Chhattisgarh.
DISSOLUTION
KINETICS OF URANIUM FROM A LOW GRADE
URANIUM ORE IN ACID LIXIVIANT
K.
Anand Rao and N.P.H. Padmanabhan
Ore Dressing
Group
Atomic Minerals Directorate for Exploration and Research
Begumpet, Hyderabad – 500 016
Abstract
Kinetic
studies on uranium dissolution were carried out on an uranium ore
sample from
Narwapahar, Jharkhand and a pre-concentrate obtained by physical beneficiation
of the ore sample. The dissolution was effected by leaching the feed
sample with sulphuric acid at a pH of 1.6–1.8 at 50°C with pyrolusite
(MnO2)
as the oxidant. The uranium dissolution was monitored at fixed time
intervals by drawing samples and analyzing for the U3O8 content.
It was continued up to a cumulative contact time of 12 hours. The experimental
data was analyzed using ‘shrinking unreacted core’ (SUC) model. During
the initial stages, the leaching was found to be chemical-reaction
controlled and subsequently diffusion controlled. The rate constants
for the uranium dissolution under the two different mechanisms have
been estimated.
A
STUDY ON SPECTRAL LINE INTERFERENCE OF CHROMIUM 3421.21Å ON
PALLADIUM 3421.24Å IN ULTRAMAFIC ROCKS
N.G.K.
Acharyulu1 and
Arjuna Panda2
Atomic Minerals
Directorate for Exploration and Research
Department of Atomic Energy 1Hyderabad - 500 016, 2Jamshedpur-831
002
Abstract
Determination
of palladium (Pd), a platinum group of element, by Direct Current
Arc Emission Spectrograph
(DCAES) in ultramafic rocks is fraught with the serious interference
of Chromium (Cr) 3421.21 Å on Pd 3421.24 Å (MIT Wavelength
Table, 1969). Our study shows that there is no effect of Cr up to a
concentration of 1000 ppm on Pd. The linear relationship between the
intensity of Cr 3422.74Å, the check line, and Cr 3421.21Å,
the interfering line, changes at 5000 ppm of Cr concentration. Accordingly,
two correction equations are suggested to eliminate Cr interference
on Pd.
Key words : Spectral interference, Chromium, Palladium, Ultramafic
rocks.
34S
values that ranges from +0.9 to +3.4
‰ (per mil). The range of 
