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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (3): 334-344.doi: 10.11872/j.issn.1005-2518.2021.03.180

• 矿产勘查与资源评价 • 上一篇    

云南中甸地区斑岩铜矿床的保存与夷平面关系探讨——基于地貌因子分析

张静静1,2(),冷成彪1()   

  1. 1.东华理工大学核资源与环境国家重点实验室,江西 南昌 330013
    2.东华理工大学地球科学学院,江西 南昌 330013
  • 收稿日期:2020-10-10 修回日期:2021-04-26 出版日期:2021-06-30 发布日期:2021-07-14
  • 通讯作者: 冷成彪 E-mail:Jingjingz1515@163.com;lcb8207@163.com
  • 作者简介:张静静(1993-),女,安徽阜阳人,硕士研究生,从事斑岩矿床与地貌学研究工作。Jingjingz1515@163.com
  • 基金资助:
    国家自然科学基金项目“斑岩型矿床”(42022021);“滇西北中甸岛弧印支期斑岩铜矿床的保存与剥蚀程度研究:低温年代学制约”(41373051)

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

Jingjing ZHANG1,2(),Chengbiao LENG1()   

  1. 1.State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China
    2.College of Earth Science,East China University of Technology,Nanchang 330013,Jiangxi,China
  • Received:2020-10-10 Revised:2021-04-26 Online:2021-06-30 Published:2021-07-14
  • Contact: Chengbiao LENG E-mail:Jingjingz1515@163.com;lcb8207@163.com

摘要:

夷平面具有形成时间跨度大、分布范围广的特征,是地貌学研究的基本内容。为了探讨斑岩铜矿床成矿后的保存与夷平面的关系,基于GIS技术,利用DEM数据提取了中甸地区高程、坡度及条带剖面等地貌因子,明确了中甸夷平面的高程及其分布范围。通过对该区典型成矿斑岩体(如雪鸡坪岩体)进行热史反演模拟,重建了中甸地区斑岩体的冷却和剥蚀历史。结果表明:中甸地区分布有两级夷平面,其坡度集中在0°~10°之间,并显示出高海拔(+4 100~+4 400 m、+3 100~+3 300 m)、低地势的特征;雪鸡坪岩体在早白垩世至晚中新世时期经历了长期缓慢的冷却(<1 ℃/Ma)和极低的剥蚀量(500~950 m),暗示该区夷平面的形成不晚于晚白垩世。结合前人研究,认为中甸地区广泛分布的夷平面为斑岩矿床的保存提供了有利的古地貌条件。同时,斑岩矿床的冷却历史也刻画了夷平面的形成过程,二者具有一定的耦合关系。

关键词: 斑岩铜矿床, 夷平面, GIS, DEM, 低温热年代学, 中甸地区

Abstract:

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.

Key words: porphyry copper deposits, planation surface, GIS, DEM, low-temperature thermochronology, Zhongdian region

中图分类号: 

  • P618.41

图1

中甸地区位置及高程图(a)中甸地区在青藏高原的位置;(b)中甸地区高程图1.本文样品点;2.文献Leng et al.(2018)的样品点;3.走滑断裂;4.河流"

图2

中甸地区条带剖面位置分布图"

图3

中甸地区坡度分布图"

图4

中甸地区条带剖面图"

图5

中甸地区夷平面分布图[据Clark et al.(2006)修改]"

图6

中甸地区现代地貌特征(a)中甸地区卫星影像图[蓝色线条为分图(b)、(c)的边界线];(b)雪鸡坪、普朗矿床卫星影像图;(c)雪鸡坪、普朗矿床DEM高程图"

表1

中甸地区斑岩矿床位置和测年结果汇总"

样品编号采样位置海拔/m锆石U-Pb/Ma锆石(U-Th)/He/Ma磷灰石(U-Th)/He/Ma
XJP11-2999.85° E,28.00° N3 556214±2.5128.3±13.323.1±1.2
XZK3301-6899.85° E,28.00° N3 592215.6±1.556.2±4.6
XZK3301-53099.85° E,28.00° N3 130214.2±1.4142.0±7.620.8±1.5
PL12-34*99.98° E,28.03° N3 950217.0±1.3146.1±9.262.5±5.8

图7

雪鸡坪岩体的时间—温度曲线注:图中的绿色区域表示所有可接受的时间—温度曲线,其拟合度大于0.05;紫色区域包含所有“好”的时间—温度曲线,其拟合度大于0.6;紫色区域中黑色的粗线表示每个区域的加权平均冷却曲线"

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