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Goswami, J. N.
- From Dust to Life: the Origin and Evolution of our Solar System
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PDF Views:87
Authors
Affiliations
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 106, No 10 (2014), Pagination: 1435-1436Abstract
No Abstract.Full Text
- Water in the Lunar Interior
Abstract Views :191 |
PDF Views:84
Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 110, No 8 (2016), Pagination: 1536-1539Abstract
Presence and distribution of water and other volatiles in the lunar interior could have played a key role in the early evolution of the Moon. We report abundance of water along with F and Cl, in apatite present in the Apollo 15 lunar basalt 15555, considered to be the primitive end member of the low-Ti mare basalt suite. Apatites are rare in this basalt and are devoid of significant spatial variation in volatile content. Considering a late-stage crystallization of apatite, we infer 100- 160 ppm water, 80-90 ppm fluorine and 10-20 ppm chlorine in the parent magma of 15555. The inferred water content is much lower than that reported for the parent magma of lunar volcanic glasses, as well as in melt inclusions trapped within the glasses that sampled much deeper regions of Moon. This difference suggests a non-uniform distribution of water and other volatiles in lunar mantle source regions, that could have significantly influenced early thermochemical evolution of the Moon.Keywords
Apatite, Lunar Interior, Mare Basalt, Moon, Water.Full Text
- U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution
Abstract Views :345 |
PDF Views:82
Authors
Affiliations
1 Department of Earth Sciences, Manipur University, Imphal 795 003, IN
2 Institute of Geosciences, Mineralogy, J.W. Goethe University, Frankfurt 60438, DE
3 Centre for Atmospheric and Ocean Sciences, Indian Institute of Science, Bengaluru 560 012, IN
4 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Department of Earth Sciences, Manipur University, Imphal 795 003, IN
2 Institute of Geosciences, Mineralogy, J.W. Goethe University, Frankfurt 60438, DE
3 Centre for Atmospheric and Ocean Sciences, Indian Institute of Science, Bengaluru 560 012, IN
4 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 113, No 07 (2017), Pagination: 1394-1402Abstract
A study of U–Pb and Lu–Hf–Yb isotope data in zircons from metamorphosed psammopelite and quartzite from the type area of Archaean Sargur Group, Dharwar Craton, India is carried out. Two age populations are observed: an older population with concordant U–Pb ages between 2.7 and 2.8 Ga, and a younger population with ages in the 2.4–2.6 Ga age range. The εHf values of 0 to +2.0 for the older zircon population suggest that they were derived from juvenile crust formed at 2.7–2.8 Ga. Sub-chondritic εHf values for the younger population indicate metamorphism and/or crustal reworking at ~2.5 Ga. Metasedimentary enclaves in the Sargur type area are therefore part of the gneiss–supracrustal complex of different antiquities and may not have an independent stratigraphic status.Keywords
Detrital Zircon, High- and Low-Grade Metamorphism, Isotope Analysis, Supracrustal Rocks.Full Text
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