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首页> 外文期刊>Journal of Tethys >The Role of Carbonate-Host Rocks on the Genesis of Pb-Zn Deposits, Northern Thrust Zone, Kurdistan Region, Iraq .
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The Role of Carbonate-Host Rocks on the Genesis of Pb-Zn Deposits, Northern Thrust Zone, Kurdistan Region, Iraq .

机译:伊拉克库尔德斯坦地区北部冲断带的碳酸盐岩在铅锌矿床成因中的作用。

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摘要

Pb-Zn deposits in the Kurdistan Region, northern Iraq, have occurred mainly as a stratabound and open-space filling ore bodies. They are hosted by dolostone and dolomitic-limestone of platform carbonates. The ore deposits at the studied Dure and Lefan areas are respectively hosted by Kurra Chine (upper Triassic) and Bekhme (upper Cretaceous) formations. Pyrite, sphalerite and galena are the major sulfides minerals, but the mineral paragenesis and relative proportions of these sulfides vary from deposit to other. They have commonly been deposited through dissolution/replacement process and/or through void infilling. Homogenization temperatures of primary and secondary fluid inclusions in Dure and Lefan deposits range from 45 oC to 183 oC and from 68 oC to 284 oC, respectively. The salinity is ranging from 13.93 wt% NaCl equiv. to >23 wt% NaCl equiv. in Dure deposit, and from 3.06 wt% NaCl equiv. to 14.57 wt% NaCl equiv. in Lefan deposit. The average δ34S‰ values for sulfide minerals (pyrite, sphalerite and galena) of the Dure and Lefan deposits are -0.8 ‰ and 1.8 ‰, respectively. Sulfur isotope analysis implies that the sulfur in sulfide deposits is originated from a mixture of different sources. The δ13C and δ18O values of carbonate host rocks fall in the range of marine carbonates. Petrographic evidence and stable isotope data with fluid inclusions suggest that Pb-Zn mineralization was caused by deeply circulating high temperature mineralizing fluids (brines) within the source basin or by tectonic processes, which possibly leached metals from either the diagenesis of host rocks and/or the dewatering of deeper buried siliciclastic beds. The studied carbonate-hosted Pb-Zn deposits share many similarities with the Mississippi Valley Type (MVT) deposit.
机译:伊拉克北部库尔德斯坦地区的Pb-Zn矿床主要以地层约束和露天填充矿体的形式发生。它们由台地碳酸盐的白云岩和白云岩-石灰岩所包裹。在研究的杜尔和勒凡地区的矿床分别由三叠纪上层的库拉奇纳(Kurra Chine)和白垩纪上层的贝赫姆(Bekhme)形成。黄铁矿,闪锌矿和方铅矿是主要的硫化物矿物,但矿物质的共生性和这些硫化物的相对比例因矿床而异。它们通常通过溶解/置换过程和/或通过空隙填充而沉积。杜尔和勒凡矿床中一次和二次流体包裹体的均质温度分别为45 oC至183 oC和68 oC至284 oC。盐度为13.93 wt%NaCl当量。到> 23 wt%NaCl当量在Dure沉积物中,当量为3.06 wt%的NaCl。相当于14.57 wt%的氯化钠在乐凡存款。杜尔和勒凡矿床的硫化物矿物(黄铁矿,闪锌矿和方铅矿)的平均δ34S‰值分别为-0.8‰和1.8‰。硫同位素分析表明,硫化物矿床中的硫源自不同来源的混合物。碳酸盐基质岩的δ13C和δ18O值在海相碳酸盐范围内。岩石学证据和稳定的同位素数据以及流体包裹体表明,铅锌矿化是由于源盆地内深循环的高温矿化流体(盐水)或构造过程引起的,这些过程可能从基质岩和/或成岩作用中浸出金属。深埋的硅质碎屑岩床的脱水。所研究的碳酸盐质铅锌矿床与密西西比河谷类型(MVT)矿床有许多相似之处。

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