西藏崩错似斑状正长花岗岩锆石U-Pb年龄、地球化学特征及其构造意义
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摘要
崩错似斑状正长花岗岩构造上处于北冈底斯东段,岩体侵位的最新地层为中—晚侏罗世拉贡塘组。其中似斑状正长花岗岩的LA-ICP-MS锆石~(206)Pb/~(238)U年龄为116.7±1.2 Ma,时代为早白垩世中期。岩石具高SiO_2、富Al_2O_3和K_2O,贫TiO_2、MgO、CaO特征,A/CNK=0.94～1.91(平均1.16),属于高钾钙碱性—钾玄岩系列过铝质岩石。(La/Yb)_N为1.22～9.62,δEu=0.04～0.38,球粒陨石标准化稀土元素分布型式为轻稀土轻度富集的U亏损型。大离子亲石元素及高场强元素Rb、K、Th、Ta、Ce相对富集,Nb相对亏损,Ba、Sr、P、Ti强烈亏损,显示具同碰撞型花岗岩特征,成岩岩浆源自地壳。结合最新资料及本文研究成果,初步认为崩错地区似斑状正长花岗岩可能形成于冈底斯带与羌塘地块陆—陆碰撞构造背景,是碰撞过程中下地壳增厚并部分发生熔融的产物,同时也表明班公湖—怒江新特提斯洋俯冲结束的时间应早于116 Ma。结合本区域年龄成果,在崩错地区班公湖—怒江新特提斯洋俯冲结束,并开始发生冈底斯带与羌塘地块陆—陆碰撞的时间为120 Ma左右。
Objectives: The geological tectonic properties of the central and northern Gangdese belts have different understandings so far. Therefore,magmatic rock petrology,zircon U-Pb geochronology and geochemical research in the belt are of great significance. The purpose of this paper is to investigate the genesis and geodetic background of the Bengco Lake plaque-like syenogranite in order to provide basic data for the Early Cretaceous magma—tectonic evolution in the northern Gangdese,and to provide new evidence and important restraints for studying the Mesozoic tectonic evolution of the entire Gangdese.Methods: The processing of major elements,rare earths and trace elements was completed by the Huayang Mine Testing Center. The test was completed by the Chengdu Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources. The main elements,trace elements and rare earth elements were detected by ICP-MS,ICP-AES,gravimetric method,etc. The analytical precision is better than 5%. Zircon single mineral separation was completed by Sichuan Huayang Rock Mine Testing Center. The Central South Mineral Resources Supervision and Inspection Center of the Ministry of Land and Resources embarked on cathodoluminescence( CL)image acquisition and LA-ICP-MS zircon U-Pb dating. Before the analysis,the instrument was optimized by the synthetic silicate glass standard reference material NIST610 which developed by the American National Institute of Standards and Technology. In order to control the stability of the instrument and control the test accuracy,one Sample 91500 and standard NIST 610 test were performed after testing 6 unknown samples using standard zircon91500 to calibrate Pb/U isotope fractionation. The data processing uses the GLITTER( ver4. 0,Macquarie University) and ISOPLOT( ver 3.0) software programs.Results: The Bengcuo plaque-like syenogranite is located in the eastern section of the northern Gangdese,and the latest stratum of the rock mass emplacement is the Middle—Late Jurassic Lagongtang Formation. The LA-ICPMS zircon206 Pb/238 U age of the plaque-like syenogranite is 116.7±1.2 Ma,and the age is the early Cretaceous. The rock has high SiO_2,rich Al_2 O_3 and K_2 O,and is lack of Ti O_2,MgO and CaO. A/CNK equals 0. 94 ～ 1. 91( average 1.16),belonging to the high potassium-calcium-alkaline potassium series of aluminous rocks.( La/Yb)N is 1.22 ～ 9.62,δEu is 0.04 ～ 0.38,and the rare earth element distribution pattern of chondrite is U-loss type with light enrichment of light rare earth. Large ion lithophile elements and high field strength elements Rb,K,Th,Ta,Ce are relatively enriched and Nb is relatively depleted and Ba,Sr,P,Ti are strongly depleted,showing the characteristics of colliding granite,diagene magma originating from the earth's crust.Conclusions: Based on the latest data and the research results of this paper,it is preliminarily believed that the Bengcuo plaque-like syenogranite in the fault-disrupted area may be formed in the land—land collisional tectonic setting of the Gangdese belt and the Qiangtang block,which is the partial melting of the thickening lower crust during the collision. The results also indicate that the end of the Bangong Lake—Nujiang New Tethys subduction should be earlier than 116 Ma. Combined with the aging results of the region,when the Bangong Lake—Nujiang New Tethys subduction ended,the time of the Gangdese belt and the Qiangtang block land—land collision was around 120 Ma.
Objectives: The geological tectonic properties of the central and northern Gangdese belts have different understandings so far. Therefore,magmatic rock petrology,zircon U-Pb geochronology and geochemical research in the belt are of great significance. The purpose of this paper is to investigate the genesis and geodetic background of the Bengco Lake plaque-like syenogranite in order to provide basic data for the Early Cretaceous magma—tectonic evolution in the northern Gangdese,and to provide new evidence and important restraints for studying the Mesozoic tectonic evolution of the entire Gangdese.Methods: The processing of major elements,rare earths and trace elements was completed by the Huayang Mine Testing Center. The test was completed by the Chengdu Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources. The main elements,trace elements and rare earth elements were detected by ICP-MS,ICP-AES,gravimetric method,etc. The analytical precision is better than 5%. Zircon single mineral separation was completed by Sichuan Huayang Rock Mine Testing Center. The Central South Mineral Resources Supervision and Inspection Center of the Ministry of Land and Resources embarked on cathodoluminescence( CL)image acquisition and LA-ICP-MS zircon U-Pb dating. Before the analysis,the instrument was optimized by the synthetic silicate glass standard reference material NIST610 which developed by the American National Institute of Standards and Technology. In order to control the stability of the instrument and control the test accuracy,one Sample 91500 and standard NIST 610 test were performed after testing 6 unknown samples using standard zircon91500 to calibrate Pb/U isotope fractionation. The data processing uses the GLITTER( ver4. 0,Macquarie University) and ISOPLOT( ver 3.0) software programs.Results: The Bengcuo plaque-like syenogranite is located in the eastern section of the northern Gangdese,and the latest stratum of the rock mass emplacement is the Middle—Late Jurassic Lagongtang Formation. The LA-ICPMS zircon206 Pb/238 U age of the plaque-like syenogranite is 116.7±1.2 Ma,and the age is the early Cretaceous. The rock has high SiO_2,rich Al_2 O_3 and K_2 O,and is lack of Ti O_2,MgO and CaO. A/CNK equals 0. 94 ～ 1. 91( average 1.16),belonging to the high potassium-calcium-alkaline potassium series of aluminous rocks.( La/Yb)N is 1.22 ～ 9.62,δEu is 0.04 ～ 0.38,and the rare earth element distribution pattern of chondrite is U-loss type with light enrichment of light rare earth. Large ion lithophile elements and high field strength elements Rb,K,Th,Ta,Ce are relatively enriched and Nb is relatively depleted and Ba,Sr,P,Ti are strongly depleted,showing the characteristics of colliding granite,diagene magma originating from the earth's crust.Conclusions: Based on the latest data and the research results of this paper,it is preliminarily believed that the Bengcuo plaque-like syenogranite in the fault-disrupted area may be formed in the land—land collisional tectonic setting of the Gangdese belt and the Qiangtang block,which is the partial melting of the thickening lower crust during the collision. The results also indicate that the end of the Bangong Lake—Nujiang New Tethys subduction should be earlier than 116 Ma. Combined with the aging results of the region,when the Bangong Lake—Nujiang New Tethys subduction ended,the time of the Gangdese belt and the Qiangtang block land—land collision was around 120 Ma.
引文
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