Discussion on the Relationships Between Planation Surface and Preservation of Porphyry Copper Deposits in the Zhongdian Region，Yunnan Province，SW China：Constraints from Geomorphic Factor Analysis
Received date: 2020-10-10
Revised date: 2021-04-26
Online published: 2021-07-14
The planation surface formation and its distribution have the characteristics of long-time span and wide distribution range， which is the basic content of geomorphology research.In order to discuss the relationship between the preservation of porphyry copper deposits after mineralization and the planation surface， based on geographic information system（GIS）platform，the paper extracted various geomorphic factors，such as the elevation，the slope and swath profile from digital elevation model（DEM）data，and then the elevation and distribution range of the planation surface were defined in the Zhongdian region.The Zhongdian region is located at the southeastern Tibetan Plateau.In this paper，DEM data from National Aeronautics and Space Administration（NASA） were used to calculate the slope value of 0°~61° in Zhongdian region by GIS technology platform，and the areas with low slope value（0°~10°）were reclassified.Meanwhile，the profile elevation of the Zhongdian region is accurately depicted by using the strip profile，and then the elevation values of the planation surface （+4 100~+4 400 m and +3 100~+3 300 m） and the topographic relief were visually displayed，indicating the distribution height of the planation surface in Zhongdian region.In this study，the thermal history of the typical porphyry（such as Xuejiping complex）was simulated，and the cooling and denudation history of the complex were reconstructed，and the cooling curve were obtained.The results show that the slope distribution in Zhongdian region was concentrated in two planation surfaces between 0° and 10°，revealing the characteristics of the high elevation and low topography.The Xuejiping complex experienced a prolonged slow cooling from the Upper Cretaceous to Late Miocene（<1 ℃/Ma），and the denudation extremely low（500~950 m），reflecting the tectonic quiet period.The process suggests that the planation surface was formed earlier than Late Cretaceous and finally in the Miocene.Combined with the former research results，the widely distributed planation surface in Zhongdian area provides favorable paleogeomorphologic conditions for the preservation of Late Triassic porphyry deposits.As the same time，the cooling history of porphyry deposits also describes the formation process of planation surface，and there is a certain coupling relationship.The existence of planation surface in Zhongdian region not only directly provides geomorphological evidence of surface uplift，but also further supports the stepwise uplift geodynamic model of the southeastern Tibetan Plateau.
Jingjing ZHANG , Chengbiao LENG . Discussion on the Relationships Between Planation Surface and Preservation of Porphyry Copper Deposits in the Zhongdian Region，Yunnan Province，SW China：Constraints from Geomorphic Factor Analysis[J]. Gold Science and Technology, 2021 , 29(3) : 334 -344 . DOI: 10.11872/j.issn.1005-2518.2021.03.180
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