A method for locating ore bodies by geochemical indexes of pegmatite-type lithium deposits in the Ke'eryin area, western Sichuan, China

TANG Wenchun; DUAN Wei; ZOU Lin; YANG Guibing; ZHANG Wei; XIONG Guan

doi:10.12090/j.issn.1006-6616.20222812

Volume 28 Issue 5

Oct. 2022

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Article Navigation > Journal of Geomechanics > 2022 > 28(5): 765-792

LI Tiancheng, FANG Weixuan, WANG Lei, et al., 2022. Application of integrated geophysical method in prospecting: A case study of the magnetite-type IOCG deposits in the Moon Mountain exploration area, Copiapo, Chile. Journal of Geomechanics, 28 (1): 22-35. DOI: 10.12090/j.issn.1006-6616.20222802

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TANG W C，DUAN W，ZOU L，et al.，2022. A method for locating ore bodies by geochemical indexes of pegmatite-type lithium deposits in the Ke'eryin area, western Sichuan, China[J]. Journal of Geomechanics，28（5）：765−792 doi: 10.12090/j.issn.1006-6616.20222812

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A method for locating ore bodies by geochemical indexes of pegmatite-type lithium deposits in the Ke'eryin area, western Sichuan, China

doi: 10.12090/j.issn.1006-6616.20222812

TANG Wenchun^1
,,
DUAN Wei^{1, 2
,
,},
ZOU Lin^{1, 2},
YANG Guibing¹,
ZHANG Wei^{1, 2},
XIONG Guan^{1, 2}

1.
Geochemistry Exploration Team of Sichuan Bureau of Geology and Minerals Resources, Deyang 618000, Sichuan, China
2.
Sichuan Deep Resource Geological Exploration Co., Ltd., Deyang 618000, Sichuan, China

Funds: This research is financially supported by the Science and Technology Planning Project of the Sichuan Bureau of Geology and Minerals Resources (Grant SCDKKJXM–2018002) and Sichuan Geology and Mineral Bureau Geochemical Exploration Team Self-funded Scientific Research Special (Grant HT–KY–2022–003)

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Abstract

Abstract

The Ke'eryin area in Sichuan province is one of the large rare metal ore concentration areas in the Songpan–Garze metallogenic belt. Numerous granite pegmatite dikes spread around the Ke'eryin mass. However, locating rare metal dikes in such a large pegmatite field has always been one of the challenges in this region. This paper summarized the geochemical element distribution in the Ke'eryin pegmatite and put forward geochemical indexes, e.g., characteristic element indexes, indicator indexes and grade indexes, to locate rare metal ore in the Ke'eryin area based on a systematic petrogeochemical analysis of two-mica granite, pegmatite microcline albite granite, different pegmatite types and typical deposits. Characteristic element indexes include Li, B, Sn, Rb, Be, Nb and Ta, etc. Indicator indexes for lateral variation are Cs, Tl, F, Zr, Y and ΣREE elements as well as values, e.g., TiO₂/Ta, Zr/Hf, Ta/Zr, Nb/Ta, K/Na, etc., while indicator indexes for vertical variation include B, U, Zr, Be, Sn, Rb, Sr, Ba, Tl and In, etc. The variation in these indexes can be used to locate rare-metal-mineralized pegmatite, indicating ore bodies in a deep basin. Grade indexes are aluminum saturation index（A/CNK, A/NK）and rittmann index(σ), etc. Li ore grade is positively correlated with aluminum saturation but is negatively correlated with alkalinity. Grade index variation is a good indicator of lithium enrichment in ore bodies.
- geochemical indexes,
- pegmatite,
- lithium deposits,
- orebody location,
- Ke'eryin area

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