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EARTH OUTGASSING AND CARBONATE FACIES DEVELOPMENT vis‐à‐vis MESOZOIC CARBONATES OF HIMALAYA
Author(s) -
Bhat M. I.
Publication year - 1983
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1983.tb00590.x
Subject(s) - geology , proterozoic , carbonate , archean , geochemistry , outgassing , facies , paleozoic , mesozoic , sedimentary rock , rift , precambrian , magmatism , mantle (geology) , paleontology , tectonics , structural basin , chemistry , materials science , organic chemistry , metallurgy
Carbonate deposition through the Earth's history shows two distinct changes in terms of volume and chemistry. Whereas carbonates comprise a very small percentage of the total sedimentary rocks in the Proterozoic, they constitute 20–25% at the present time. From the Archaean to Early Palaeozoic, carbonates are dominantly dolomites, whereas afterwards they are dominantly limestone. 87 Sr/ 86 Sr, δ 18 0 and δ 13 C trends show an increase with decreasing age. All these features of carbonate rocks are explicable as being related to the increased episodic outgassing of CO 2 and CH 4 from the upper mantle throughout the Earth's history. The Mesozoic carbonates of Himalaya are correlatable with the CO 2 outgassing associated with rifting and magmatism during the birth of the Tethys ocean.