Volume 23 Issue 2
Apr.  2017
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YANG Jing, ZHENG De-wen, CHEN Wen, et al., 2017. 40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE. Journal of Geomechanics, 23 (2): 232-242.
Citation: YANG Jing, ZHENG De-wen, CHEN Wen, et al., 2017. 40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE. Journal of Geomechanics, 23 (2): 232-242.

40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE

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  • Received: 2016-11-01
  • Published: 2017-04-01
  • Supergene jarosite is widely distributed in oxidation zone of sulphide deposits in arid-semiarid area. Precise 40Ar/39Ar age constraints of supergene jarosite can not only define the timing of sulfide secondary enrichment, but also provide key information on the geochronology to the regional geomorphic evolution and paleoclimatic evolution. In this article, 40Ar/39Ar laser incremental heating analysis of jarosite from the Liuhuangshan copper polymetallic deposit in Tu-Ha Basin is conducted, and the age of Eocene weathering mineral is defined for the first time. Combined with the published chronology data, it indicates that the profile of oxidation zone of ore deposit from the higher elevation sites recorded the more complete and lasting regional weathering events. The presence of ancient weathering ages in current outcrops in Tu-Ha Basin suggests that denudation was not homogeneous, and the landscape evolution followed a scarp retreat model. The ages in this present study and published ages demonstrate that chemical weathering and supergene enrichment under an arid-semiarid climate are mainly concentrated in the following period:27.7~23.3、16.4~14.7、11~7.8 Ma. After the 11~7.8 Ma, a progressive change from arid-semiarid climate towards hyperarid climatic, and predominantly hyperarid climate may had persisted at least since 4.1~3.3 Ma.

     

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