| 西准噶尔南部晚古生代侵入岩特征和构造背景 |
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| 引用本文： | 党飞鹏,王居里,杨猛,宋子升.西准噶尔南部晚古生代侵入岩特征和构造背景[J].地质与资源,2011,20(6):440-451. |
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| 作者姓名： | 党飞鹏 王居里 杨猛 宋子升 |
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| 作者单位： | 西北大学地质学系, 陕西 西安 710069 |
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| 摘 要： | 西准噶尔地区南部达拉布特断裂两侧广泛发育晚古生代花岗岩类,其锆石U-Pb年龄范围为337～276 Ma,属早石炭世-早二叠世.基于前人相关研究资料和成果,总结区内花岗岩类的岩石学、地球化学特征,认为:①岩石类型从早到晚由中性的闪长岩向酸性的花岗岩及碱长花岗岩转变.相应地,成因类型由埃达克岩质花岗岩→岛弧I型花岗岩-A型...
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| 关 键 词： | 花岗岩类 俯冲板片断离 后碰撞 晚古生代 西准噶尔 |
| 收稿时间： | 2011-06-21 |
CHARACTERISTICS AND TECTONIC SETTING OF LATE PALEOZOIC PLUTONS IN THE SOUTH OF WESTERN JUNGGAR |
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| DANG Fei-peng
,
WANG Ju-li
,
YANG Meng
,
SONG Zi-sheng.CHARACTERISTICS AND TECTONIC SETTING OF LATE PALEOZOIC PLUTONS IN THE SOUTH OF WESTERN JUNGGAR[J].Geology and Resources,2011,20(6):440-451. |
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| Authors: | DANG Fei-peng WANG Ju-li YANG Meng SONG Zi-sheng |
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| Institution: | Northwest University, Xi'an 710069, China |
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| Abstract: | Abundant Late Paleozoic granitoid, which emplaced during Early Carboniferous Visean to Early Permian Artinskian with zircon U-Pb ages ranging from 337 to 276 Ma, is distributed along both sides of the Dalabute fault in the south of Western Junggar. Based on the previous published geological and geochemical data about the granitoid in this area, this paper concludes the changing tendency of the granitoid from early to late： 1 ） In corresponding to the rock type change from diorite to granite and alkali feldspar granite, the genetic types show the variation of adakitic granite - arc I-type granite - A-type granite. 2） The rock series present a regular variation of CA - HKCA - SH, with the ratios of Na20/K20 turning from Na20/K20 〉 1 to Na20/K20 〈 1, correspondingly. 3） The ∑ REE, 8Eu, L/H and contents of Sr and Yb of the granitoid vary regularly, with relatively enriched LILE but depleted HFSE, such as Nb, Ta, etc. 4） All the granitoid have high 6Nd （t） and low （S7Sr/S6Sr）i values, with young Nd-model ages. 5） On the discrimination diagram for tectonic setting, that of the granitoid turns from compressional setting associated with subduction-collisional to extensional setting of postcollision. All of these suggest that the granitoid should be resulted from the transition from compression to extension. The early magmatism is probably related to the breakup of the subducted slab. |
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| Keywords: | granitoid breakup of subducted slab post-collision Late Paleozoic Western Junggar |
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