NDLI: Atacamite and nantokite in Kaerqueka copper deposit of Qimantag area: Evidence for Cenozoic climate evolution of the Qaidam Basin

Content Provider	Springer Nature Link
Author	Yi, Liwen Gu, Xiangping Lu, Anhuai Li, Xiangyu Zhang, Dexian Wang, Zhiling Liu, Jianping Li, Shuai Shu, Zhengxiang Yu, Cui Zuo, Hongyan Shen, Can
Copyright Year	2017
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.
Starting Page	492
Ending Page	499
Page Count	8
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	28
Issue Number	3
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2017-06-10
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	atacamite nantokite climate evolution Qaidam Basin Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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