Pamganamamula, Rao V.; Puffer, John H. (1996) Geochemistry, Petrogenesis and Tectonic Setting of Proterozoic Mafic Dyke Swarms, Eastern Dharwar Craton, India. Journal Geological Society of India, 47 (2). 165-174 doi:10.17491/jgsi/1996/470203
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Geochemistry, Petrogenesis and Tectonic Setting of Proterozoic Mafic Dyke Swarms, Eastern Dharwar Craton, India | ||
| Journal | Journal Geological Society of India | ||
| Authors | Pamganamamula, Rao V. | Author | |
| Puffer, John H. | Author | ||
| Year | 1996 (February 1) | Volume | 47 |
| Page(s) | 165-174 | Issue | 2 |
| Publisher | Geological Society of India | Place | Bangaluru, India |
| URL | |||
| DOI | doi:10.17491/jgsi/1996/470203Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 19251083 | Long-form Identifier | mindat:1:5:19251083:1 |
| GUID | 0 | ||
| Full Reference | Pamganamamula, Rao V.; Puffer, John H. (1996) Geochemistry, Petrogenesis and Tectonic Setting of Proterozoic Mafic Dyke Swarms, Eastern Dharwar Craton, India. Journal Geological Society of India, 47 (2). 165-174 doi:10.17491/jgsi/1996/470203 | ||
| Plain Text | Pamganamamula, Rao V.; Puffer, John H. (1996) Geochemistry, Petrogenesis and Tectonic Setting of Proterozoic Mafic Dyke Swarms, Eastern Dharwar Craton, India. Journal Geological Society of India, 47 (2). 165-174 doi:10.17491/jgsi/1996/470203 | ||
| In | (1996, February) Journal of the Geological Society of India Vol. 47 (2). Geological Society of India | ||
| Abstract/Notes | Abstract Extensive swam of thick (10 to 80 m) en echelon Proterozoic dolerite dykes have intruded the Archaean gneissic/granitic rocks of the Eastern Dharwar Craton of Peninsular India. Dykes in the southern half of the craton, including a cluster of 12, strike mostly E-W, whereas those exposed in the northern half including two clusters of 25 and 6 dykes, strike NW and ENE, as well as E-W and N-S. All the dykes sampled from the southern group plot along a continuous tholeiitic fractionation trend and are characterised by low concentrations of FeO(T), TiO2, and P2O5 (an LFTP group) averaging 11.5,0.85, and 0.15 wt% respectively. About two-thirds of the 25 dykes sampled from the northern group are also LFTP dykes, but the remaining third (a HFTP group) contain much higher FeO(T), TiO2, and P2O5 (averaging 152.2, and 0.45 wt/%). The HFTP is clearly enriched in high field strength and heavy rare earth elements compared to the LFTP group, suggesting independent magma sources. The LFTP dyke population is chemically rlnlike any plume or island are related magmatism and differs from most continental-rift related, within-plate tholeiites. It is, however, similar to the Mesozoic rift related olivine normative dolerite dyke population of Eastern North American province and its low- Ti (LTQ) counterpart. The chemical composition of the LlTP population is consistent with a MORBlike source that has experienced considerable crustal contamination. The HFTP dyke population is chemically typical of continental flood basalt (CFB) magmatism, such as the Deccan basalt, and is interpreted as magma derived from a plume source that has assimilated some lithospheric rock. | ||
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