摘要
镇远羊坪地区位于坪地—贡溪向斜震旦—寒武纪地层出露区,距离著名的大河边重晶石矿床约30km,区内已发现老文溪、高马山重晶石矿床和若干矿点,具有优越的成矿地质背景。重晶石矿产于老堡组地层中,含矿岩系具有与区域上大河边重晶石矿床高度相似的地质特征,构成底板硅质岩→重晶石矿层→炭质页岩的韵律层。矿体产状与围岩一致,在剖面上呈层状、似层状产出,在走向及倾向上厚度变化不大,矿石品位与矿体厚度呈弱的正相关性,重晶石是主要的矿石矿物。通过研究含矿岩系和矿石构造在垂向上的变化规律,本文认为羊坪地区的重晶石也是海底热液喷流形成的,矿体形成于深水、滞留、还原、非补偿性盆地,重晶石受静岩压力作用从饱和溶液中结晶析出。
The Yangping area in Zhenyuan district is in the outcrop area of the Pingdi-Gongxi syncline which compromised of Aurignacian-Cambrian rocks. It is about 30 km from the famous Dahebian barite deposit, and the Laowenxi and Gaomashan barite deposits and several occurrences have been found, showing a superior geological background for mineralization. The barite is found in the Laobao formation, and the ore-bearing rock system has highly similar geological characteristics to the regional barite deposits in Dahebian, forming a rhyolite layer of basal siliceous rock → barite ore layer → carbonaceous shale. The ore body production is consistent with the surrounding rocks, and is laminated and stratiform in profile, with little thickness variation in strike and tendency, and a weak positive correlation between ore grade and ore body thickness, with barite being the main ore mineral. By studying the variation pattern of the ore-bearing rock system and ore structure in the vertical direction, this paper concludes that the barite in the Yangping area was also formed by submarine hydrothermal jets, and the ore body was formed in a deep-water,stagnant, reductive, non-compensatory basin, and the barite was crystallized and precipitated from the saturated solution by the action of static rock pressure.
作者
杜红毅
徐石辉
DU Hong-yi;XU Shi-hui(106 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 563000,China)
出处
《中国非金属矿工业导刊》
2023年第1期65-69,共5页
China Non-Metallic Minerals industry
关键词
羊坪地区
老文溪
重晶石
地质特征
Yangping area
Laowenxi
barite
geological characteristics
