Petrology and Geochemistry of the Ultramafic Rocks of Yerrabali Schist Belt, Eastern Dharwar Craton, Telangana, India

被引:0
|
作者
Ramachandran, G. [1 ]
Das, Sankha [2 ]
机构
[1] Geol Survey India, State Unit Karnataka & Goa, Bengaluru 560011, India
[2] Geol Survey India, NER, Shillong, India
关键词
Yerrabali schist belt; ultramafic; spinel peridotite; mid oceanic ridge (MOR); PLATINUM-GROUP ELEMENTS; MYANMAR OROGENIC BELT; ABYSSAL PERIDOTITES; ANDAMAN OPHIOLITE; CHROMIAN SPINEL; MELT EXTRACTION; TRACE-ELEMENTS; MANTLE; OLIVINE; COMPLEX;
D O I
10.17491/jgsi/2024/173892
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Yerrabali schist Belt (YSB) is a NW-SE trending 10 km long and 4 km wide belt located at the north eastern corner of Eastern Dharwar Craton (EDC) consisting of Banded Magnetite Quartzite (BMQ), ultramafic rocks, quartz-cordierite- gedrite +/- garnet bearing schist, sillimanite-garnet-cordierite schist, metadolomite, amphibolite, ferruginous quartzite, tremolite schist and dolerite dyke. The ultramafic rocks consist of olivine, orthopyroxene, clinopyroxene and spinel. The Fe content of olivine varies from 88-91 and consists of high amount of NiO (0.3-0.511%). Orthopyroxone are enstatitic and clinopyroxene are Mg-augite in nature. The spinel grains are rich in Al2O3 (48.32-59.09%) and show very low Cr# values (0.08-0.29). Thermo-barometric analyses show equilibrium condition of 700 degrees-1100 degrees C temperature and 19-21 kb pressure. Oxygen fugacity of the ultramafic rocks range from -0.035 to -1.356 log units below FMQ buffer. Low Cr# values of spinel along with low oxygen fugacity suggest their formation by low degrees of partial melting from a less refractory Mid Oceanic Ridge (MOR) type mantle.
引用
收藏
页码:692 / 706
页数:15
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