辽宁第IV金刚石成矿带东部潘家沟辉绿岩中铬铁矿的矿物化学特征及其意义

doi:10.19388/j.zgdzdc.2024.03.05

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Abstract Yongning area has been classified as the fourth diamond metallogenic belt in Liaoning Province due to the discovery of primary diamond. However, the diamond source has not yet been determined so far, and it is necessary to reinforce the study of the indicator minerals associated with the diamond. The compositions of chromite selected from the diabase in Panjiagou area in the eastern Yongning area were analyzed by electron microprobe, and they are compared with the chromite from typical kimberlite pipes in Liaoning Province to explore chromite genesis and the relationship with diamonds. According to the particle sizes, morphology, and melting erosion characteristics in the back-scattered electron images of chromite samples and the composition feature of high Cr, rich Mg, low Al and poor Ti through electron probe micro analysis, the authors speculated that the chromite come from mantle xenocryst, belonging to chromite subclass, which is mainly mafic-chromium-aluminium- ferrum subspecies and mafic-chromium-aluminium subspecies. The calculated formation temperatures of the chromite are 1 252~1 307 ℃, which is consistent with the reported formation temperatures of the chromite in Wafangdian kimberlite, and is also closed to the formation temperature of diamonds. It indicates an affinity relationship between chromites and diamonds, and great potential for diamond prospecting in the diabases of Panjiagou area. This study is significant for the exploration of primary diamond deposits and the identification of the diamond sources in Panjiagou area.

Key words： the fourth diamond metallogenic belt in Liaoning Province diabase kimberlite chromite prospecting and exploration of primary diamond deposit

Received: 23 August 2023

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	Articles by authors
	YANG Xianzhong
	ZHOU Yan
	XIAO Fan
	XU hua
	LAO Jinxiu
	XIANG Hua

Cite this article:

YANG Xianzhong,ZHOU Yan,XIAO Fan, et al. Mineralogical chemical characteristics of chromite from diabase in Panjiagou area of the eastern fourth diamond metallogenic belt and its significance in Liaoning Province[J]. , 2024, 11(3): 32-41.

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http://journal25.magtechjournal.com/Jwk_dzdc/EN/10.19388/j.zgdzdc.2024.03.05 OR http://journal25.magtechjournal.com/Jwk_dzdc/EN/Y2024/V11/I3/32

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