Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area: Evidence for Cenozoic Climate Evolution of the Qaidam Basin

Liwen Yi; Xiangping Gu; Anhuai Lu; Xiangyu Li; Dexian Zhang; Zhiling Wang; Jianping Liu; Shuai Li; Zhengxiang Shu; Cui Yu; Hongyan Zuo; Can Shen

doi:10.1007/s12583-017-0548-8

Volume 28 Issue 3

Jun 2017

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Journal of Earth Science > 2017 > 28(3): 492-499.

Liwen Yi, Xiangping Gu, Anhuai Lu, Xiangyu Li, Dexian Zhang, Zhiling Wang, Jianping Liu, Shuai Li, Zhengxiang Shu, Cui Yu, Hongyan Zuo, Can Shen. Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area: Evidence for Cenozoic Climate Evolution of the Qaidam Basin. Journal of Earth Science, 2017, 28(3): 492-499. doi: 10.1007/s12583-017-0548-8

Citation:

Liwen Yi, Xiangping Gu, Anhuai Lu, Xiangyu Li, Dexian Zhang, Zhiling Wang, Jianping Liu, Shuai Li, Zhengxiang Shu, Cui Yu, Hongyan Zuo, Can Shen. Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area: Evidence for Cenozoic Climate Evolution of the Qaidam Basin. Journal of Earth Science, 2017, 28(3): 492-499. doi: 10.1007/s12583-017-0548-8

Citation:

Liwen Yi, Xiangping Gu, Anhuai Lu, Xiangyu Li, Dexian Zhang, Zhiling Wang, Jianping Liu, Shuai Li, Zhengxiang Shu, Cui Yu, Hongyan Zuo, Can Shen. Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area: Evidence for Cenozoic Climate Evolution of the Qaidam Basin. Journal of Earth Science, 2017, 28(3): 492-499. doi: 10.1007/s12583-017-0548-8

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Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area: Evidence for Cenozoic Climate Evolution of the Qaidam Basin

doi: 10.1007/s12583-017-0548-8

Liwen Yi¹,
Xiangping Gu^2,3,
Anhuai Lu^{2,3
,
,},
Xiangyu Li⁴,
Dexian Zhang^2,3,
Zhiling Wang^2,3,
Jianping Liu^2,3,
Shuai Li^2,3,
Zhengxiang Shu^2,3,
Cui Yu^2,3,
Hongyan Zuo^2,3,
Can Shen^2,3

1.
College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China
2.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitor, Ministry of Education, Changsha 410083, China
3.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
4.
Hunan Institute of Geological Survey, Changsha 410116, China

More Information

Author Bio:
Liwen Yi: http://orcid.org/0000-0003-3098-9852

Anhuai Lu: http://orcid.org/0000-0002-6942-4544
Corresponding author: Anhuai Lu, ahlu@pku.edu.cn
Received Date: 13 Apr 2016
Accepted Date: 17 Aug 2016
Publish Date: 01 Jun 2017

Abstract

Abstract

Using a mineralogy method to reflect climate evolution is a new approach to research Cenozoic environmental progression of the Qaidam Basin. In this paper, we present the chemical composition and crystallographic parameter of atacamite, nantokite, and tenorite in cryptocrystalline aggregates from the Kaerqueka copper deposit of Qimantag metallogenic belt by means of electron microprobe and in-situ X-ray diffraction analyses. Atacamite and nantokite occur in an intimate intergrowth as the secondary precipitation of chalcopyrite and bornite filling in the interstitial space of andradite in the Kaerqueka copper deposit, with an average composition of Cl: 12.38 wt.%, Cu: 63.76 wt.%, O: 21.46 wt.%. X-ray microdiffraction shows that the intergrowth contains nantokite with a cubic unit cell a=5.403(2) Å and atacamite with an orthorhombic unit cell a=6.030(3), b=6.883(2), c=9.114(1) Å. XRD quantitative calculation shows that the nanometric aggregate contains 36.07 wt.% tenorite, 18.41 wt.% atacamite, and 45.52 wt.% nantokite. The presence of nantokite and atacamite requires saline solutions for their formation and hyper-arid climate conditions for their preservation. Combined with the data of salt lakes and the pollen sequence of western China, we suggest that during the uplift of the Tibetan Plateau and the retreat of the Paratethys, saline water was forced to the surface through a basal fracture zone. In the hyper-arid climate of the Qaidam Basin, the recharge of groundwater by direct precipitation is negligible, and groundwater is derived from inflow from the salt lakes. Thus, atacamite is preserved. In addition, spertiniite in the edge and fractures of atacamite and nantokite may represent wetter climate after the formation of atacamite and nantokite.
- atacamite,
- nantokite,
- climate evolution,
- Qaidam Basin

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References(43)

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