川西甲基卡烧碳沟地区伟晶岩脉地球化学特征

doi:10.19388/j.zgdzdc.2021.01.08

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Abstract Based on petrological and geochemical investigations of the pegmatite veins in Shaotangou area, this paper discusses their origin and tectonic setting. The results show that SiO₂ content of the pegmatite veins in Shaotangou ranges from 73.46% to 75.96%, and the total alkaline content ranges from 4.71% to 7.36%, with Rittman index of 0.7 to 1.84, which indicates that the rocks have calc-alkaline characteristics. The aluminum saturation index (A/CNK) of the pegmatite veins is over 1.1 (1.54 to 2.49), indicating that these rocks belong to peraluminous S-type granite. The major, trace and rare earth elements data of the pegmatite veins indicate that they are mainly sourced from clay sediments. They have similar trace and rare earth elements distribution and Nb/Ta ratio, compared with Jiajika two-mica granite. And these two pegmatite veins are cogenetic and belong to highly differentiated granite. The tectonic setting analysis shows that the pegmatite veins are classified as syn-collision granite, and that the dome structure in Jiajika area provides a favorable structural environment for the formation of the rare metal pegmatite veins during the relative stable late stage of Indo-China movement.

Key words： Jiajika Shaotangou geochemistry petrogenesis pegmatite

Received: 28 April 2020

:	P588.131
	P618.6

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	Articles by authors
	WU Wenhui
	ZHAO Chun
	ZHAN Hanyu
	QIN Yulong
	LI Mingze
	XU Yunfeng

Cite this article:

WU Wenhui,ZHAO Chun,ZHAN Hanyu, et al. Geochemical characteristics of the pegmatite veins in Shaotangou area, Jiajika of Western Sichuan Province[J]. , 2021, 8(1): 71-79.

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http://journal25.magtechjournal.com/Jwk_dzdc/EN/10.19388/j.zgdzdc.2021.01.08 OR http://journal25.magtechjournal.com/Jwk_dzdc/EN/Y2021/V8/I1/71

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