Difference between komatiites and picrites and a discussion on some Late Paleozoic "komatiites"

LI Zhenhuan; LIU Xuelong; ZHU Yueqin; ZHANG Qi; LUO Ying; ZHANG Changzhen; CHEN Jianhang; WANG Shuaishuai; YANG Fucheng

2019 Vol. 38, No. 12

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LI Zhenhuan, LIU Xuelong, ZHU Yueqin, ZHANG Qi, LUO Ying, ZHANG Changzhen, CHEN Jianhang, WANG Shuaishuai, YANG Fucheng. Difference between komatiites and picrites and a discussion on some Late Paleozoic 'komatiites'[J]. Geological Bulletin of China, 2019, 38(12): 1971-1980.

Citation:

LI Zhenhuan, LIU Xuelong, ZHU Yueqin, ZHANG Qi, LUO Ying, ZHANG Changzhen, CHEN Jianhang, WANG Shuaishuai, YANG Fucheng. Difference between komatiites and picrites and a discussion on some Late Paleozoic "komatiites"[J]. Geological Bulletin of China, 2019, 38(12): 1971-1980.

Difference between komatiites and picrites and a discussion on some Late Paleozoic "komatiites"

1.
College of Land and Rresources Eengineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Key Laboratory of Geological Information Technology, Ministry of Natural Resources, Beijing 100037, China
3.
Development Research Center, China Geological Survey, Beijing 100037, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

More Information

Corresponding author: LIU Xuelong, xuelongliu@foxmail.com

Received Date: 20 April 2019

Revised Date: 30 July 2019

Publish Date: 15 December 2019

Abstract

Abstract

In the past, academia paid much attention to the similarity between komatiites and picrites, but ignored their differences. In this paper, the global data of Archaean komatiites and Post-Archaean low/high titanium picrites in the database were collected by full data model. Based on comparing the differences between them, the authors found that komatiites are richer in MgO, Cr, Ni, Cs, Pb, Co and Zn, followed by low-titanium picrites (except for Co and Zn). As for the other main and trace elements, high-titanium picrites has the highest content, followed by low-titanium picrites and then by komatiites. Based on the differences between elements such as Cr/Ga, MgO/Ga, MnO/Zr and Cr/Zr, the authors used density distribution to draw an isodensity discriminant map which can effectively distinguish the three types of rocks, and redefined the lithology of some Late Paleozoic "komatiites" with this diagram. The results of lithofacies and geochemical characteristics show that, in the Late Paleozoic "komatiites", the rocks in the eastern part of India are high-titanium picrites, those in Vietnam are low-titanium picrites with similar chemical composition to komatiites, and those in Ladak area of India are low-titanium picrites.
- komatiites /
- low/high titanium picrites /
- discriminant maps /
- Late Paleozoic /
- redefine

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