乌拉溪铝质A型花岗岩:松潘—甘孜造山带早燕山期热隆伸展的岩石记录
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摘要
乌拉溪岩体位于松潘—甘孜造山带南段,江浪穹隆北部。LA-ICP-MS锆石U-Pb定年获得岩体年龄为159.31±0.9Ma。岩石中出现含钙钠长石和铁叶云母等A型花岗岩典型矿物;岩体具有高SiO2、Na2O和K2O含量,高FeOt/MgO、Ga/Al比值,以及低TiO2、CaO和MgO含量特征;稀土元素配分模式呈右倾海鸥型,Eu负异常明显;微量元素富含Rb、Nb和Ga等高场强元素,原始地幔标准化蛛网图显示出Ba、Sr、P和Ti亏损;岩体中锆石的古核稀少,锆石饱和温度计算显示岩体成岩温度很高(变化在967~984℃之间);岩体还相对富铝,A/CNK=0.97~1.27,分布比较集中,都大于0.95,过碱指数(NK/A=0.74~0.91)较低,均在1之下。以上特征表明乌拉溪二云母花岗岩为铝质A型花岗岩。锆石n(176Hf)/n(177Hf)比值变化于0.282228~0.282749,平均值为0.282586,fLu/Hf为-0.99~-0.10,平均值为-0.90,εHf(t)绝大多数为负值,变化于-15.88~1.77之间,平均值为-3.14,说明岩石形成是壳源物质占主导地位,可能为江浪穹隆核部元古宙变质核杂岩的部分熔融。结合区域构造演化,本文认为乌拉溪二云母花岗岩形成于陆—陆碰撞之后的伸展环境,是甘孜—松潘造山带在燕山早期增厚的地壳因伸展松弛而发生减压熔融的产物。
The Wulaxi granite is located in the southern region of Songpan—Garze orogenic belt,northern margin of Jianglang dome. The LA-ICP-MS analysis of zircons from the intrusion yield a weighted mean206Pb /238U age of 159. 31 ± 0. 9Ma. Albite and siderophyllite appear in rocks,which are belong to typical minerals of A type granite. The intrusion is characterized by high content of SiO2,Na2O and K2O,high FeOt/ MgO and Ga / Al ratio, and low content TiO2,CaO and MgO. The granite is marked by a"sea-gull"pattern of REE distribution,showing a relatively significant negative Eu anomaly,and rich high field strength elements such as Rb,Nb and Ga et. al, exhibiting remarkably negative Ba,Sr,P and Ti anomalies on the primitive mantle-normalized trace element diagram. The intrusion shows high forming temperature through calculations of zircon saturation temperatures( ranging from 967℃ to 984℃) and lacked ancient nucleus in CL images of zircon. The intrusion also is relatively rich in aluminum with A / CNK = 0. 97 ~ 1. 27( > 0. 95) and NK / A = 0. 74 ~ 0. 91( < 1). These characteristics resemble aluminous A-type granite. In Zircon,n(176Hf) / n(177Hf) = 0. 282228 ~ 0. 282749,average 0. 282586, fLu / Hf=- 0. 99 ~- 0. 10,average- 0. 97,most εHf( t) are negative(-15. 88 ~1. 77),average-3. 14,which indicates that the rock dominantly come from the crust,and probably originated from the partial melting of Proterozoic Metamorphic core complex in Jianglang dome. Combined with regional tectonic evolution,We suggest that the Wulaxi granite formed in an extensional setting after the continent—continent collision,and originated from the early Yanshanian decompressing melt of the thickening crust because of extensing relaxation after collision in the Songpan—Garze orogenic belt.
The Wulaxi granite is located in the southern region of Songpan—Garze orogenic belt,northern margin of Jianglang dome. The LA-ICP-MS analysis of zircons from the intrusion yield a weighted mean206Pb /238U age of 159. 31 ± 0. 9Ma. Albite and siderophyllite appear in rocks,which are belong to typical minerals of A type granite. The intrusion is characterized by high content of SiO2,Na2O and K2O,high FeOt/ MgO and Ga / Al ratio, and low content TiO2,CaO and MgO. The granite is marked by a"sea-gull"pattern of REE distribution,showing a relatively significant negative Eu anomaly,and rich high field strength elements such as Rb,Nb and Ga et. al, exhibiting remarkably negative Ba,Sr,P and Ti anomalies on the primitive mantle-normalized trace element diagram. The intrusion shows high forming temperature through calculations of zircon saturation temperatures( ranging from 967℃ to 984℃) and lacked ancient nucleus in CL images of zircon. The intrusion also is relatively rich in aluminum with A / CNK = 0. 97 ~ 1. 27( > 0. 95) and NK / A = 0. 74 ~ 0. 91( < 1). These characteristics resemble aluminous A-type granite. In Zircon,n(176Hf) / n(177Hf) = 0. 282228 ~ 0. 282749,average 0. 282586, fLu / Hf=- 0. 99 ~- 0. 10,average- 0. 97,most εHf( t) are negative(-15. 88 ~1. 77),average-3. 14,which indicates that the rock dominantly come from the crust,and probably originated from the partial melting of Proterozoic Metamorphic core complex in Jianglang dome. Combined with regional tectonic evolution,We suggest that the Wulaxi granite formed in an extensional setting after the continent—continent collision,and originated from the early Yanshanian decompressing melt of the thickening crust because of extensing relaxation after collision in the Songpan—Garze orogenic belt.
引文
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