摘要
索尔库都克矿床是近年来新疆境内探明的中型铜(钼)矿床。对其成矿地质环境、矿床地质特征、夕卡岩及其分带的研究表明。该矿床之夕卡岩与Д.С.柯尔仁斯基(1955)所划分的类夕卡岩相类似。该夕卡岩是由凝灰砂岩、安山玢岩等变质形成的。流体包裹体和稳定同位素的研究表明,该矿床是我国特殊的层状夕卡岩矿床,与接触交代夕卡岩矿床明显不同。
Located in Xinjiang, the Xorkuduk copper (molybdenum) deposit is a medium-sized deposit demonstrated in recent years. Technically it lies in the Variscan orogenic belt. The host rocks are tuffaceous sandstone and andesite porphyrite, no carbonate rocks being found. The skarn minerals include salite, garnet and epidote, which formed under the condition of a low W/R ratio. The skarn is similar to the skarnoid proposed by D. C. Korshinsky (1955).The homogenization temperatures of fluid inclusions are 560 -303 ℃ for epidote, 438 ℃ for garnet and mainly 200-140℃ for quartz and calcite. The salinity (WNaCl) is mainly in two ranges (4% - 14% and 30% -34%). The ore fluids belong to the K+-Na+-Crsystem. The pressure is 35 -70 MPa.The hydrogen and oxygen isotopic values (SD= -101‰---102‰ and δ18OH.o = 2. 3‰ -5. 6‰) suggest that the fluids were magma water mixed with a small amount of meteoric water. δ34S values of -3. 4‰-1.5‰ with an average value of - 1. 8‰ indicate that sulfur was mainly derived from deep sources and partly from host rocks. The carbon and oxygen isotopic values ofcalcite (δC= - 5. 8‰---3. 3‰ and δ18O = 7. 5‰ -8. 2‰) show that carbon was also derivedfrom a deep source. δ30Si=0‰ - 0. 1‰, showing no difference in the silica source.In a word, the Xorkuduk deposit is a special stratiform gkarn-type deposit in China, which is notably different from contact metasomatic skarn-type deposits.
出处
《地质论评》
CAS
CSCD
北大核心
1995年第2期165-173,共9页
Geological Review
关键词
夕卡岩
铜矿床
钼矿床
地质特征
矿床成因论
skarnoid, metallogenic environment, fluid inclusion, stable isotope, Xorkuduk
