| 云南省鹤庆小天井锰矿赋矿地层的时代及其找矿意义 |
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| 关键词:Xiaotianjing Mn deposit klippe gondolella Late Permian |
| 基金项目:中国地质调查局“中国矿产地质志”项目(编号: DD20221695; DD20190379)；“战略新兴产业地质调查工程”项目(编号: DD20230034)和科技部科技基础资源调查专项“中国战略性新兴产业矿产资源数据整编及图集编纂”课题(编号: 2022FY101702) |
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| Age and Prospecting Significance of the Ore-bearing Strata in the Xiaotianjing Mn Deposit, Heqing, Yunnan Province |
| There has long been controversy over the stratigraphic age of the ore-bearing formations in the Xiaotianjing manganese mine in Heqing County. We collected gondolella fossils from both the roof and floor of the main orebody in the Xiaotianjing manganese deposit. In the roof, four species of Clarkina-bearing fossils were identified: Clarkina leveni leveni, Clarkina liangshanensis, Clarkina bitteri, and Xaniognathus elongatus Sweet, belonging to the Clarkina leveni leveni zone of the middle Wujiapingian age of the Late Permian. From the floor, Diplognathodus sp. A was obtained, which dates to the Middle–Late Permian (P2-3). This fossil is mainly found in the upper part of the Maokou Formation of the Middle Permian in China and also occurs in corresponding formations of the Upper Permian. Based on the characteristics of these gondolella fossils, the stratigraphic age of the ore-bearing formations in the Xiaotianjing manganese deposit was determined to be the Late Permian and should be attributed to the Upper Permian Wujiaping Formation. Meanwhile, both the rock cores obtained from deep drilling and surface observations confirmed that the “klippe” limestone (T2b) originally located above the manganese-bearing formations is in conformable contact with the underlying manganese-bearing formations, indicating that there is no tectonic nappe forming the “klippe” in this area. With the stratigraphic age of the manganese-bearing formations in this area now clarified, further manganese ore prospecting has shifted to the Late Permian Wujiaping Formation. It is noteworthy that there is cerussite in the Xiaotianjing manganese ore, which is a type of manganese ore related to volcanism. Attention should be paid to prospecting for manganese ore in small volcanic sedimentary basins located on the volcanic sedimentary margins far from the eruption zones within volcanic sedimentary basins. |
| ZHANG Yifei,YANG Xuexiong,WANG Yan.2025.Age and Prospecting Significance of the Ore-bearing Strata in the Xiaotianjing Mn Deposit, Heqing, Yunnan Province[J].Acta Geoscientica Sinica,46(1):88-92. |
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