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| Minerogenic prospective prognosis of leaching type turquoise on the northwestern margin of Wudang Uplift |
| Jian ZHANG1,2,3, Xue-Zhong YU3, Yi-Chuan LI3 |
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
3. Aero Geophysical Survey & Remote Sensing Center for Natural and Resources, Beijing 100083, China; |
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Abstract Turquoise, a phosphate mineral assemblage of Cu, Al, is a valuable gem mineral. The western margin of Wudang Uplift in Hubei-Shaanxi border is an important producing area of high quality turquoise. Based on an analysis of geological characteristics and geological conditions of turquoise deposits, the authors hold that turquoise deposits mainly occur in lower Cambrian (carbon-bearing) siliceous rocks and are controlled by fault structures. Combined with the geophysical and geochemical characteristics of the deposits, the authors point out some ore-hunting indicators of turquoise deposits in this area as follows: Cambrian (carbon-bearing) siliceous strata, well-developed fault structures, areas with high Cu content, and areas with high radioactivity (high U content). According to geological, geophysical and geochemical data, the first and second order minerogenic prospective areas of turquoise were delineated.
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Received: 11 September 2018
Published: 10 April 2019
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Regional geological map of Wudang uplift area
NSF—Ning Shan fault;SHYF—Shi Yan fault;AKF—An Kang fault;MLS—Mian Lue(Mianxian-Lueyang) suture;Pt—Proterozoic;P—Permian;T—Trias;J—Jurassic;K—Cretaceous;Pt3-Pz1—Neoproterozoic-Early Paleozoic;γPt—Proterozoic granite;γPz—Paleozoic granite
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Geological schematic map of western margin of Wudang uplift
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Geological map of Yue’ertan mining area
1—Quaternary; 2—upper Cambrian Wugongya formation; 3—middle Cambrian Yuejiaping formation; 4—lower Cambrian Shuigoukou formation; 5—revered anticline; 6—Turquoise deposits
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Aeromagnetic shadow of fault structure in the western margin of the Wudang uplift
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| 点号 | 经度 | 纬度 | w(U)/10-6 | 地质概况 | | 1 | 110°20’01″ | 32°42’16″ | 3.9 | 含长石的辉绿岩 | | 2 | 109°57’12″ | 32°29’44″ | 4.4 | 云母石英千枚岩片岩 | | 3 | 109°51’33″ | 32°28’44 | 2.8 | 灰绿片岩 | | 4 | 109°30’27″ | 32°19’54″ | 5.4 | 粗面岩 | | 5 | 109°15’58″ | 32°54’01″ | 3.1 | 绢云母千枚岩 | | 6 | 109°13’38″ | 32°55’28″ | 1.2 | 泥质灰岩 | | 7 | 109°20’32″ | 32°44’26″ | 7.7 | 含石英条带的含炭硅质片岩 | | 8 | 109°20’22″ | 32°43’44″ | 23.9 | 有褐铁矿化的含炭硅质片岩 | | 9 | 109°20’22″ | 32°43’44″ | 58.1 | 硅质岩 | | 10 | 109°20’22″ | 32°43’44″ | 105.1 | 含炭硅质板岩 | | 11 | 109°30’25″ | 32°52’06″ | 3.4 | 千枚岩 | | 12 | 109°42’21″ | 32°56’15″ | 6.8 | 含炭硅质片岩,含黄铁矿化 | | 13 | 109°47’16″ | 32°52’53″ | 13.7 | 灰黑色含颗粒状黄铁矿化炭质、硅质片岩 | | 14 | 110°18’27″ | 32°44’38″ | 15.9 | 含炭硅质板岩,含石英条带 | | 15 | 110°18’24″ | 32°44’41″ | 7.8 | 含炭硅质板岩,含石英条带 | | 16 | 110°18’20″ | 32°44’41″ | 13.7 | 厚层状含炭硅质板岩 | | 17 | 109°57’31″ | 32°25’50″ | 14.39 | 含炭硅质板岩 | | 18 | 109°57’36″ | 32°25’49″ | 12.63 | 含炭硅质板岩 | | 19 | 109°57’36″ | 32°25’50″ | 104.07 | 含炭硅质板岩 |
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U content in some measured strata of Turquoise mining area in Hubei Province
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Turquoise and abnormal content area of Cu in the western margin of Wudang uplift
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Turquoise and gamma-ray spectrum isoline map of U element content in the western margin of Wudang uplift
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Content of Cu and U in the western margin of Wudang uplift
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| 特征指标 | 矿床数量/个 | 所占百分比/% | | Cu异常、强放射性 | 9 | 56.25 | | 强放射性 | 6 | 37.50 | | Cu异常 | 1 | 6.25 |
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Statistics of turquoise deposits characteristics in the western margin of Wudang uplift
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Forecast of Turquoise metallogenic prospect
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