Characteristics of Indicator Minerals of the Shantou Diamond Placer Deposit in Sixian County, Anhui Province

DONG Zhong-Dou|CAI Yi-Tao|CAO Zheng-Qi|ZHANG Jie|XIANG Hua|KANG Cong-Xuan

doi:10.3969/j.issn.2097-0013.2021.02.003

2021 Vol. 37, No. 2

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Article navigation > South China Geology > 2021 > 37(2): 151-163

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DONG Zhong-Dou|CAI Yi-Tao|CAO Zheng-Qi|ZHANG Jie|XIANG Hua|KANG Cong-Xuan. 2021. Characteristics of Indicator Minerals of the Shantou Diamond Placer Deposit in Sixian County, Anhui Province. South China Geology, 37(2): 151-163. doi: 10.3969/j.issn.2097-0013.2021.02.003

Citation:

DONG Zhong-Dou|CAI Yi-Tao|CAO Zheng-Qi|ZHANG Jie|XIANG Hua|KANG Cong-Xuan. 2021. Characteristics of Indicator Minerals of the Shantou Diamond Placer Deposit in Sixian County, Anhui Province. South China Geology, 37(2): 151-163. doi: 10.3969/j.issn.2097-0013.2021.02.003

Characteristics of Indicator Minerals of the Shantou Diamond Placer Deposit in Sixian County, Anhui Province

DONG Zhong-Dou|CAI Yi-Tao|CAO Zheng-Qi|ZHANG Jie|XIANG Hua|KANG Cong-Xuan¹

1. Changsha Natural Resources Comprehensive Survey Center, China Geological Survey, Changsha 410600, Hunan, China;
2. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China

Received Date: 10 March 2021

Revised Date: 04 April 2021

Abstract

Abstract

The origin of diamonds from the Shantou diamond placer in Sixian County, Anhui Province, has been controversial. After the discovery of alkaline-basic-rock-type diamond in the Lan’gan area of Suzhou, Anhui Province, some scholars believe that the Lan’gan area might be the source of the Shantou diamond placer. The electron microprobe analyses of indicator minerals (garnet and chromite) in Shantou diamond placer show that in the formula A₃²⁺B₂³⁺（SiO₄）₃ of garnet, A is mainly occupied by Mg²⁺, Fe²⁺ and Ca²⁺, while B is mainly occupied by Al³⁺ and a small amount of Mn³⁺, and the garnets are mainly almandine (ALM), followed by magnesium aluminum garnet (PYP), and belong to G3, G4 garnets of Fe-Al, Mg-Al and Ca-Al garnet series. The chromites contain more than 40 wt% Cr₂O₃, average 8 wt% MgO, and 0.11 ~ 2.26 wt% TiO₂, and belong to the medium-chromium chromites and are the same as those found in kimberlites of Shandong and Liaoning provinces, which indicates that they did not come from the alkaline-basic-rock-type primary diamond deposit in the Lan’gan area.
- garnet /
- chromite /
- Shantou diamond placer deposit /
- Sixian County, Anhui Province

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