Study of Bitumen in the Huayuan Lead -Zinc Deposit—Organic geochemistry study of MVT Lead -Zinc deposit
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摘要: 湘西花垣铅锌矿床是一个产于下寒武统清虚洞组碳酸盐岩中的大型ＭＶＴ铅锌矿床，含矿岩系为大陆边缘相的藻灰岩、鲕粒灰岩夹黑色泥质条带灰岩。矿区及外围的寒武系中有大量沥青出现。矿区的沥青以细粒状、鳞片状充填于矿石的晶间孔隙或裂缝中，与闪锌矿、方铅矿共生。外围沥青多充填于石英重晶石脉的晶洞中或断裂带中。根据沥青的Ｒｏｍａｘ，Ｈ／Ｃ（原子比），Ｔｍａｘ℃，Ｐｙ-Ｇｃ，δ１２Ｃ，ＲＥＥ和微量元素测定，矿区的沥青的热演化程度较高（Ｒｏｍａｘ＝４．３２%－４．７０%；，Ｈ／Ｃ（原子比）＝０．５，Ｔｍａｘ＝４０６－６００℃），属脆沥青－２阶段，其演化程度与矿床的成矿温度相吻合（均一温度范围：８０～２００℃，均值１３５－１５１℃）。沥青的类型属原生－同层型，有机质来源可能与主岩有关，并参与成矿作用。Abstract: The Huayuan Pb -Zn deposi t is one of the large MVT Pb -Zn deposits in western Hunan.w hich is controlled by the carbonate rock in the Upper part of the Qingx udong Format ion of the Low er Cambrain.Thehost rock is algal limestone 、oolite limestone wi th dark zebra argillaceous limestone of continental margin facies.The bitumen is of frequent occurrence in ores and peripheral Cambrain of mining area.The bitumen fill the interg ranular po res or cracks in f ine grain or acaly forms and associated with sphalerite o r galena in ores.The peripheral bitumen is f illing in fault s or crystal interatic of quxrz-barite vein.On the basis of analysis and measure :Romax 、H/C(Atomic ratio), Tmax ℃, Py -Gc, δ12C 、REE and t race elements.The heat-evolutionay grade of bitumen is higher in mining area which is corresponding with g rahamite -Ⅱ stage and also consistent with mineralization-temperature(rang :80 -200 ℃, mean :135 -151 ℃).The type of bitumen is syngenetic-identical strata ty pe and the organic mat ter is possible to come f rom host rock and participated the mineralization of this deposit.
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Key words:
- MVT lead -Zinc /
- deposit /
- bitumen
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