Granitic rocks, widely developed in the Lamasu copper ore region, western Tianshan were formed at 390.5±7.7 Ma according to the SHRIMP zircon U-Pb dating of the plagioclase granite porphyry. Based on the regional...Granitic rocks, widely developed in the Lamasu copper ore region, western Tianshan were formed at 390.5±7.7 Ma according to the SHRIMP zircon U-Pb dating of the plagioclase granite porphyry. Based on the regional tectonic evolution and published chronological data of both diagenesis and mineralization, the Biezhentao- Kokirqin region was rolled into the orogen associated with the closure of Yili Ocean during early Devonian. The N-S-trending thrust faults were formed during this period and accompanied by the intrusion of granitic rocks. On this stage, the paleo-Asian Ocean Plate entered into the early collision orogenic phase and the plagioclase granite porphyry intruded （390.5±7.7 Ma） and replaced with limestone of the Mesoproterozoic Kusongmuqieke Group, Jixianian System and formed the early phase of skarn-type copper mineralization in the Lamasu region. Furthermore, the subduction-melting of Bayingou Ocean Plate during Carboniferous generated a deep-seated magmatic chamber in the Lamasu copper ore region which located in the northwestern part of the Paleozoic Biezhentao-Kokirqin island arc. The magmatic chamber segregated Cu-bearing magmas, which transported upward to the shallow earth crust along the faults or fractures and formed the Cu-hosting porphyry. According to the research on the characteristics of the ore deposit and the ore-forming environment as mentioned above, the Lamasu Cu-Zn deposit was characterized by the superposing of mineralization at different geological settings and it was skarn-porphyritic type.展开更多
The Lamasu copper polymetallic mineralized region lies in the south of Wenquan County, Xinjiang and in the Northwest lakeside of the Sailimu Lake. Seen from the geotectonic position, it belongs to North Tianshan geodo...The Lamasu copper polymetallic mineralized region lies in the south of Wenquan County, Xinjiang and in the Northwest lakeside of the Sailimu Lake. Seen from the geotectonic position, it belongs to North Tianshan geodome system, Tianshan diwa region, Central Asian crustobody. Copper and zinc polymetallic ore bodies had been formed in the skarn of the contact, between the metamophic carbonate rocks of the Kuximqiek Group, Jixian System and early mid Varisean acidic rockbodies. The formation of the ore deposit was the result of the successive activities of the crust and mantle and the tectonic and magmatic activities.展开更多
新疆北部的喇嘛苏铜矿是一个较典型的夕卡岩型矿床 ,通过对该矿区内不同类型岩石的稀土元素地球化学研究 ,建立了各类岩石的 REE分布模式 ,探讨了矿区内中酸性浅成岩、碳酸盐岩、夕卡岩、基性岩脉等 4种主要岩石类型的稀土元素地球化学...新疆北部的喇嘛苏铜矿是一个较典型的夕卡岩型矿床 ,通过对该矿区内不同类型岩石的稀土元素地球化学研究 ,建立了各类岩石的 REE分布模式 ,探讨了矿区内中酸性浅成岩、碳酸盐岩、夕卡岩、基性岩脉等 4种主要岩石类型的稀土元素地球化学行为 ,认为该矿区内不同类型的岩石具有 REE分布型式相近、具清晰的 Eu负异常及弱 Ce负异常、w (L a) n/w (Sm ) n 值普遍高于w (Gd) n/w(Yb) n 值等共性 ,相比之下浅成岩具有较低的 w (L a) n/(w Yb) n 值与变化范围偏宽的δ(Eu)值 ,碳酸盐岩具有较高的 w (L a) n/w (Yb) n 值与变化范围偏窄的δ(Eu)值 ,夕卡岩的 w (L a) n/w (Yb) n 值与δ(Eu)值变化范围刚好居于这二者之间 ,中酸性浅成岩有随着 Si O2 质量分数增高而δ(Eu)展开更多
为了利用高精度航磁资料进行成矿预测,需要提取弱航磁异常信息。采用航磁增强处理方法(automatic gain control,简称"AGC")对喇嘛苏铜矿所在地区的高精度航磁资料进行处理后,能够突出显示由铜等多金属矿引起的航磁弱异常信息...为了利用高精度航磁资料进行成矿预测,需要提取弱航磁异常信息。采用航磁增强处理方法(automatic gain control,简称"AGC")对喇嘛苏铜矿所在地区的高精度航磁资料进行处理后,能够突出显示由铜等多金属矿引起的航磁弱异常信息,且在赛里木湖东西两侧有许多与喇嘛苏铜矿类似的弱磁异常信息分布。笔者认为航磁增强处理方法可以提取铜、金等金属矿成矿有利的航磁微弱异常信息,划分局部成矿有利的隐伏断裂构造,为成矿预测提供科学依据。展开更多
基金the National Natural Science Foundation （No.40573028）；the National Scientific and Technological Supporting Key Projects （No.2006 BAB07B08-01） ；the Geological Survey Projects （No.1212010634001）.
文摘Granitic rocks, widely developed in the Lamasu copper ore region, western Tianshan were formed at 390.5±7.7 Ma according to the SHRIMP zircon U-Pb dating of the plagioclase granite porphyry. Based on the regional tectonic evolution and published chronological data of both diagenesis and mineralization, the Biezhentao- Kokirqin region was rolled into the orogen associated with the closure of Yili Ocean during early Devonian. The N-S-trending thrust faults were formed during this period and accompanied by the intrusion of granitic rocks. On this stage, the paleo-Asian Ocean Plate entered into the early collision orogenic phase and the plagioclase granite porphyry intruded （390.5±7.7 Ma） and replaced with limestone of the Mesoproterozoic Kusongmuqieke Group, Jixianian System and formed the early phase of skarn-type copper mineralization in the Lamasu region. Furthermore, the subduction-melting of Bayingou Ocean Plate during Carboniferous generated a deep-seated magmatic chamber in the Lamasu copper ore region which located in the northwestern part of the Paleozoic Biezhentao-Kokirqin island arc. The magmatic chamber segregated Cu-bearing magmas, which transported upward to the shallow earth crust along the faults or fractures and formed the Cu-hosting porphyry. According to the research on the characteristics of the ore deposit and the ore-forming environment as mentioned above, the Lamasu Cu-Zn deposit was characterized by the superposing of mineralization at different geological settings and it was skarn-porphyritic type.
文摘The Lamasu copper polymetallic mineralized region lies in the south of Wenquan County, Xinjiang and in the Northwest lakeside of the Sailimu Lake. Seen from the geotectonic position, it belongs to North Tianshan geodome system, Tianshan diwa region, Central Asian crustobody. Copper and zinc polymetallic ore bodies had been formed in the skarn of the contact, between the metamophic carbonate rocks of the Kuximqiek Group, Jixian System and early mid Varisean acidic rockbodies. The formation of the ore deposit was the result of the successive activities of the crust and mantle and the tectonic and magmatic activities.
文摘新疆北部的喇嘛苏铜矿是一个较典型的夕卡岩型矿床 ,通过对该矿区内不同类型岩石的稀土元素地球化学研究 ,建立了各类岩石的 REE分布模式 ,探讨了矿区内中酸性浅成岩、碳酸盐岩、夕卡岩、基性岩脉等 4种主要岩石类型的稀土元素地球化学行为 ,认为该矿区内不同类型的岩石具有 REE分布型式相近、具清晰的 Eu负异常及弱 Ce负异常、w (L a) n/w (Sm ) n 值普遍高于w (Gd) n/w(Yb) n 值等共性 ,相比之下浅成岩具有较低的 w (L a) n/(w Yb) n 值与变化范围偏宽的δ(Eu)值 ,碳酸盐岩具有较高的 w (L a) n/w (Yb) n 值与变化范围偏窄的δ(Eu)值 ,夕卡岩的 w (L a) n/w (Yb) n 值与δ(Eu)值变化范围刚好居于这二者之间 ,中酸性浅成岩有随着 Si O2 质量分数增高而δ(Eu)
文摘为了利用高精度航磁资料进行成矿预测,需要提取弱航磁异常信息。采用航磁增强处理方法(automatic gain control,简称"AGC")对喇嘛苏铜矿所在地区的高精度航磁资料进行处理后,能够突出显示由铜等多金属矿引起的航磁弱异常信息,且在赛里木湖东西两侧有许多与喇嘛苏铜矿类似的弱磁异常信息分布。笔者认为航磁增强处理方法可以提取铜、金等金属矿成矿有利的航磁微弱异常信息,划分局部成矿有利的隐伏断裂构造,为成矿预测提供科学依据。
