A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Kirmani, I. R.
- Geochemistry of Differentiated Lamprophyre Dyke, South Delhi Fold Belt, Pipela Area, District Sirohi, Rajasthan
Authors
1 Geological Survey of India, Western Region, Jhalana Dungari, Jaipur - 302 004, IN
2 Geological Survey of India, AMSE Wing, Vasudha Bhavan, K.S.Layout, Bangalore - 560 078, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 6 (2000), Pagination: 615-623Abstract
A dyke of lamprophyric composition intrudes the meta-volcanic rocks of Ajabgarh Group of the Delhi Supergroup near Pipela, Sirohi district, Rajasthan. It exhibits well-defined compositional and textural layering in the form of chilled margin, sparsely porphyritic zone, aphyric zone and central porphyritic zone. Geochemical studies of this lamprophyric rock have led to the following interpretations: (i) the lamprophyric melt was derived from a less metasomatised mantle, (ii) crustal contamination took place during ascent and/or emplacement (iii) there was sufficient time for the lamprophyric body to differentiate into well-defined layers, and (iv) there was post-emplacement hydrothermal alteration.Keywords
Lamprophyre, Dyke, Differentiation, Geochemistry, South Delhi Fold Belt, Rajasthan.
- Lamprophyre Dykes in the South Delhi Fold Belt Near Pipela, District Sirohi, Rajasthan
Authors
1 Geological Survey of India, Jhalana Dungari, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 3 (1995), Pagination: 255-261Abstract
Lamprophyre dykes are reported from the southern part of the South Delhi Fold Belt (SDFB), near Pipela, about 3 km SE of Sarupganj in Sirohi district of Rajasthan. They occur as sub-volcanic intrusives in the Ajabgarh supracrustals and follow a WNW -ESE to E-W trends. They show porphyritic and panidiomorphic textures with biotite and magnetite occurring as euhedrru phenocrysts ina cryptocrystalline matrix. One large Jamprophyre body shows acompositionallayering. Widespread alteration (chloritisation of biotite and potash depletion) suggests that they are not cogenetic with the post-Cretaceous, fresh lamprophyres of the Mundwara area. Probably these dykes are emplaced during the waning stage of the Late Proterozoic tectonomagmatic cycle of the South Delhi Fold Belt.Keywords
Lamprophyres, Delhi Fold Belt, Rajasthan.- Wall Rock Alteration in Cu-Zn-Au Bearing Volcanogenic Massive Sulphide Deposit at Danva, District Sirohi, Rajasthan
Authors
1 Geological Survey of India, Jhalana Dungri, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 4 (1998), Pagination: 391-402Abstract
The Upper Proterozoic mafic volcanic suite of the Delhi Supergroup between Nanna and Deri sectors of Rajasthan host several volcanogenic massive sulphide prospects. The massive sulphide ore body at Danva is enveloped by hydrothermally altered volcanic rocks containing sulphide-bearing stock work mineralization. Geochemistry of the unaltered metavolcanics indicate that they are basalts with calc-alkaline affinity. The main types of hydrothermillly altered rocks are quartz-biotite schist, quartz-biotite-sericite schist and quartz-sericite schist.Mass balance studies indicate marginal and significant gains of SiO2, H2O and K2O during the processes of biotitization and sericitization. Na and Ca show strong depletion. The iron oxides, in general, record marginal to heavy depletion whereas sulphur is significantly added during the hydrothermal activity. It is suggested that Au has largely been mobilized during sulphidation process.
Keywords
Economic Geology, Volcanogenic Massive Sulphide, Cu-Zn-Au, Wall Rock Alteration, Delhi Supergroup, Rajasthan.- Gold Potential of Epithermal Breccia along the Deldar- Kui-Chitrasani Fault in South Delhi Fold Belt, Southwest Rajasthan and Northern Gujarat
Authors
1 Geological Survey of India, A.M.S.E. Wing, Central Zone, Seminary Hills, Nagpur - 440 006, IN
2 Geological Survey of India, Western Region, 15-16, Jhalana Dungri, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 57, No 2 (2001), Pagination: 149-156Abstract
The Deldar-Kui-Chitrasani (DKC) fault is a brittle structure manifested by anastomosing system of fractures in the southwestern part of the South Delhi Fold Belt (SDFB). Based on the identification of cross-fibre and 'jigsaw puzzle' type structures, presence of vugs lined with cryptocrystalline quartz, replacement of calcite by chalcedonic quartz and evidences of argillic alteration, the breccia along the fault is recognised by present workers as epithermal breccia. Lithogeochemical sampling of the breccia reveals that, besides moderate base metal signatures, gold values are consistently present in significant concentrations comparable to regional anomalies associated with epithermal gold deposits in the United States. In view of the high proportion of magmatic rocks in the southwestern part of the SDFB, the DKC fault zone is considered a favourable target for searching epithermal type of gold mineralisation.Keywords
Economic Geology, Epithermal Breccia, Lithogeochemistry, Gold Anomaly, Faults, Shear Zone, South Delhi Fold Belt, Rajasthan, Gujarat.- Tourmaline as Metallogenic Indicator: Examples from Paleo-Proterozoic Pb-Zn and Cu-Au Deposits of Rajasthan
Authors
1 Geological Survey of India, PPOD Division, RSAS Wing, Kumaraswamy Layout, Bangalore - 560 078, IN
2 Geological Survey of India, Training Institute, Jaipur, IN
3 Geological Survey of India, Operations Rajasthan, Jaipur, IN
4 Geological Survey of India, WZ, RSAS, Jaipur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 3 (2010), Pagination: 215-243Abstract
Petrology and mineral chemistry of ten types of tourmalines from Pb-Zn bearing strata-bound exhalative deposits and Cu-Au-Fe deposits, presumably of IOCG-type, from Rajasthan are presented. The Pb-Zn deposits studied include Agucha, Kayar and Dariba areas in central Rajasthan, each of which is widely separated in space and occurs in isolated but coeval basins within the Archaean basement. The Cu-Au deposits include Ghagri, Bada Talav, Dugocha and Bhukia areas in southeast Rajasthan. The syngenetic Pb-Zn type and the epigenetic Cu-Au-Fe type of deposits are formed during the initial phase of Paleoproterozoic Aravalli Basin evolution with dominant deposition of shelf facies pelite-carbonate sequence of Debari Group. The post-depositional tectono-metamorphic history of the host rocks of Pb- Zn type and Cu-Au type deposits differ significantly with the former deposits showing higher metamorphic impress (amphibolite to lower granulite facies) than the latter (green schist facies).
This study suggests that tourmalines on individual deposit scale exhibit both similarities and differences in optical and chemical features that are in accordance to their bulk host mineral assemblages. But on individual belt-scale, despite significant differences in the post-depositional metamorphic alterations, there is an overall chemical similarity of tourmalines that suggests prevalence of similar hydrothermal conditions during the formation of the tourmalines of individual deposits in each of the Pb-Zn and Cu-Au belts. In many of the discriminant diagrams using the critical elements, the tourmalines of these two belts maintain a distinct identity and assert their role as metal-type indicator in contemporaneous (Paleoproterozoic) deposits formed in different hydrothermal conditions.
This study also tests the reported role of tetrahedral alumina (Aliv) and X-site vacancies (X£) in the tourmaline in indicating the grade of metamorphism of the host rocks. Whereas this study confirms the assertions regarding the covariance of Aliv with respect to the grade of metamorphism in calcareous and metapelitic sediments, the same assertions could not be made in respect of X£ for the tourmalines from different ore deposits of Rajasthan. The latter is attributed to the diffusion of Na in the tourmaline structure from the abundantly available Na+-rich host rocks (albitites) in a postore formation event.
Keywords
Tourmaline, Pb-Zn Ore Deposit, Cu-Au Ore Deposit, Stratabound, Evaporitic, Paleoproterozoic, Aravalli, Rajasthan.- Petrology, Geochemistry and Fluid Inclusion Studies of Cu-Au Mineralization in Paleoproterozoic Salumber-Ghatol Belt, Aravalli Supergroup, Rajasthan
Authors
1 Geological Survey of India, PPOD Division, SR, 40th Cross Eshwar Nagar, Bangalore - 560 082, IN
2 Geological Survey of India, Western Region, Jhalana Dungari, Jaipur - 302 004, IN
3 Geological Survey of India, AMSE Wing, West Zone, Jhanalana Dungari, Jaipur - 302004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 1 (2012), Pagination: 5-38Abstract
The Salumber-Ghatol belt in Rajasthan, India, situated along southern margin of the Aravalli Craton, hosts a cluster of Cu-Au deposits in calcitic and dolomitic marbles that belong to Debari Group of the Paleo-mesoproterozoic Aravalli Supergroup. The Fe-Mn rich dolomitic marble of the Delwara Formation hosts Cu-Au-Fe-oxide mineralization at Ghagri and associated distal K-Fe-Mg rich altered rocks (cryptocrystalline microcline + magnesioriebeckite + magnetite + phlogopite) and proximal feldspathised carbonate rocks (medium grained albite + microcline + dolomite + magnetite). The calcitic marble of Mukandpura Formation hosts Dugocha Cu-Au deposit with development of distal graphite-tourmaline-bearing albitites and proximal albite-microcline-magnetite rocks. Calcite and dolomite carbonates of Bhukia region with development of albite-actinolite-bearing alteration assemblages host the largest of the Cu-Au deposits in this belt. The second generation folds and associated ductile-brittle shear zones of the multiply deformed events constitute conduits for the mineralizing fluids at all locations in this belt.
Carbon isotope data for the dolomitic marbles of Ghagri area suggest mixed isotopic signatures: (i) normal marine values close to zero per mil (mean= -0.269 ‰) and (ii) enriched positive values (mean= +4.04 ‰) akin to the 1.9 Ga global event of positive excursion. The calcitic marbles of Dugocha area have significantly depleted δ13C values that are interpreted to be the result of pervasive inter-mixing of isotopically distinct carbon derived from primary depositional carbonates, hydrothermally exchanged carbonates, with significant influence of the organic carbon. The petrographic distinction of calcitic and dolomitic marbles of Bhukia area is corroborated by δ13C values that show a bimodal distribution of near 0 per mil and depleted values of -3 per mil. Fluid inclusion studies suggest predominance of saline brines in the ore fluids. The δ13S values for all the three deposits are narrowly constrained between 10.4 and 15.1 ‰, which suggests a common metasedimentary source for sulfur.
Identical chondrite-normalized REE patterns and primitive mantle-normalized multi-element patterns suggest a common Na- and/or K-source for the formation of Ghagri and Dugocha-Bhukia feldspathic rocks. Based on mineralization styles and attendant alteration patterns, it is argued that the mineral deposits of Salumber-Ghatol belt in the Aravalli Supergroup (i) represent sedimentary carbonate-hosted Cu-Au deposits belonging to the wider class of Proterozoic Iron-Ore-copper-Gold type (IOCG-like) mineral deposits; (ii) the fluids responsible for the mineralization are generated from common sub-crustal source and (iii) during mineralization, the influx of Na-K-rich fluids is so intense that it created 'artificial' hyper-saline conditions in the normal depositional basin that facilitated crystallization of scapolite, brucite, spadaite, povondraite and phlogopite bearing mineral assemblage.
Keywords
Petrology, Carbonates, Copper, Gold, IOCG, Mineralization, Stable Isotopes, Salumber, Ghatol, Aravalli Supergroup, Paleoproterozoic, Rajasthan.References
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