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现代地质 ›› 2013, Vol. 27 ›› Issue (3): 603-611.

• 矿床学与地球化学 • 上一篇    下一篇

云南鹤庆锰矿沉积环境研究

常海亮1,2,温兴平1,2,任涛1,2,王宏伟1,2,刘灿1,2   

  1. 1昆明理工大学 国土资源工程学院,云南 昆明650093;2云南省矿产资源预测评价工程实验室,云南 昆明650093
  • 收稿日期:2012-10-25 修回日期:2013-03-22 出版日期:2013-06-07 发布日期:2013-06-08
  • 通讯作者: 温兴平,男,教授,1970年出生,地球探测与信息技术专业,主要从事遥感地质研究工作。
  • 作者简介:常海亮,男,硕士研究生,1986年出生,地球探测与信息技术专业,主要从事沉积学、遥感地质的研究工作。Email:hlchang1986@qq.com。
  • 基金资助:

    中国地质调查局“国家危机矿山专项”(20089943);国家自然科学基金联合基金项目(U1133602);国家自然科学基金项目(41101343)。

Study of the Sedimentary Environment of Heqing Manganese Deposit, Yunnan,China

CHANG Hai-liang1,2,WEN Xing-ping1,2,REN Tao1,2,WANG Hong-wei1,2,LIU Can1,2   

  1. 1Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan650093, China;
    2Mineral Resources Prediction and Evaluation Engineering Laboratory of Yunnan Province,Kunming,Yunnan650093,China
  • Received:2012-10-25 Revised:2013-03-22 Online:2013-06-07 Published:2013-06-08

摘要:

云南鹤庆锰矿床位于扬子地台西南缘,西近三江地槽,地处这两大构造单元的过渡地带。镜下观察,该矿床矿石矿物主要有硬锰矿、菱锰矿、水锰矿、黑锰矿,含有少量的软锰矿和恩苏塔矿。金属矿物在空间上存在明显的分带现象,主要表现在17线以西以硬锰矿和软锰矿为主,10~15线则以水锰矿和菱锰矿为主,而7~10线以黑锰矿和菱锰矿为主。灰岩样品的δ13C值变化范围为-3.0‰~2.9‰,平均值为0.6‰,其δ18O值变化范围为-9.9‰~-5.5‰,平均值为-7.7‰;而矿石样品的δ13C值变化范围为-46.3‰~-9.8‰,平均值为-24.2‰,其δ18O值变化范围为-16.5‰~-3.1‰,平均值为-8.6‰。综合研究认为鹤庆锰矿形成于浅海局限环境,介质性质由酸性向碱性、由还原性向氧化性转变的过渡带是矿物就位的主要空间,同位素研究认为可能有生物成因的甲烷参与成矿。

关键词: 锰矿, 沉积环境, 同位素, 鹤庆, 云南

Abstract:

Heqing manganese deposit in Yunnan is located in the southwestern margin of the Yangtze platform, adjoining the Sanjiang geosyncline in the west. The deposit formed in the transition zone of the two tectonic units. Ore minerals are mainly psilomelane, rhodochrosite, manganite and hausmannite, containing a small amount of pyrolusite and nsutite. There is metal mineral zonation in space:minerals from No.17 exploration line to the west are mainly psilomelane and pyrolusite, from No.10 to No.15 exploration lines are mainly manganite and rhodochrosite, and from No.7 to No.10 exploration lines are mainly hausmannite and rhodochrosite. The δ13C values of the limestone samples range from -3.0‰ to 2.9‰ with a mean value of 0.6‰ and the δ18O varies between -9.9‰ and -5.5‰, averaging at -7.7‰; the δ13C values of the ore samples range from -46.3‰ to -9.8‰ with a mean value of -24.2‰ and the δ18O values vary from -16.5‰ to -3.1‰, averaging at -8.6‰. Comprehensive studies support that Heqing manganese deposit formed in a restricted shallow water environment. Ore minerals deposited in media property zone (from acid to alkaline and from reduction to oxidation), and isotope studies support that the biogenic methane might participate in mineralization.

Key words: manganese deposit, sedimentary environment, isotope, Heqing, Yunnan

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