Boonnarong Arsairai, Qinglai Feng, Chongpan Chonglakmani, Akkhapun Wannakomol, and Hathaichanok Vattanasak

DOI: 10.14456/sjst-psu.2020.79

pp. 621 - 630

Abstract

Petrography and geochemistry analyzing Dat Yai section can describe paleoproductivity and past-redox condition.
Paleoproductivity proxies consisted of AOM, phytoclast, TOC, excess SiO2, Ba/Al, and P/Al as high values through sections
which similarly indicate high productivity. High productivity in Beds 3 and 27 showed lower peak TOC which is explained by
poorer preservation. Lower productivity of Bed 18 showed a high TOC peak indicating good preservation. Paleoredox condition
was evaluated using Ni/Co, U/Th, V/Cr, V/(V+Ni), Ni/V, and (Cu+Mo)/Zn. Values for V/(V+Ni) ranged from 0.67 to 0.85
exceeding the cutoff value of 0.46 for a reducing environment. The average value of V/Cr (2.07) exceeded 2.0 of anoxic. Bed 9
consisted of the highest peak of TOC that does not reflect the excellent preservation resulting from dominantly high
paleoproductivity. Bed 21 exhibited lower productivity and lowest TOC which indicated a poverty-reducing effect. AOM and
phytoclasts were supplied and kept in the benthic floor by extreme redox. Sediments became black shale which expelled oil and
some gas.