Compositional features and P-T conditions of granulite xenoliths from Late Cretaceous mafic dike, Qingdao region
文献类型：期刊论文
| 作者 | Zhang Jin; Zhang HongFu |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 23期号:5页码:1133-1140 |
| 关键词 | granulite xenolith Late Cretaceous mafic dike equilibrium temperature Qingdao lower crust |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Late Cretaceous mafic dike in Qingdao region, China contains two types of granulite xenoliths: the pyroxene-rich granulites and the plagioclase-rich granulites. The pyroxene-rich granulites are mainly composed of a mineral assemblage of Opx + Cpx + PI and have fine-grained re-crystallized texture. The mineral assemblage for the plagioclase-rich granulites is dominantly Opx + Cpx + PI + Q or Opx/Cpx + PI + Q and show medium- and coarse-grained texture. All granulites have relatively low Mg-# in pyroxenes (<66). The clinopyroxenes in these granilite xenoliths have chemical characteristics of high Na and low Ca, which is close to those for the granulites derived from magma underplating. Equilibrated temperatures calculated from the cpx-opx geothermometers are in a range of 847 similar to 911 degrees C. Combined with the geobarometry of the plagioclase-rich granulites and the geotherm, the petrological Moho was 33 similar to 36km at depths, broadly consistent with the seismic Moho. This shows that there was no obvious crust-mantle transition zone in the Qingdao region in the Late Mesozoic. The mineralogical characteristics of these granulite xenoliths and repeated magmatism in the Jiaodong region imply that the lower crust granulites were different from those of typical Archean lower crust granulite terrain or xenoliths. Their formation could be the result of the interaction between the old lower crust of the North China craton and the underplating magma. |
| WOS关键词 | SINO-KOREAN CRATON ; LOWER CRUSTAL XENOLITHS ; NORTH CHINA CRATON ; LITHOSPHERIC MANTLE BENEATH ; ANHUI PROVINCE ; EAST CHINA ; EVOLUTION ; HANNUOBA ; NUSHAN ; GEOCHEMISTRY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000248135100025 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67764]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang Jin |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang Jin,Zhang HongFu. Compositional features and P-T conditions of granulite xenoliths from Late Cretaceous mafic dike, Qingdao region[J]. ACTA PETROLOGICA SINICA,2007,23(5):1133-1140. |
| APA | Zhang Jin,&Zhang HongFu.(2007).Compositional features and P-T conditions of granulite xenoliths from Late Cretaceous mafic dike, Qingdao region.ACTA PETROLOGICA SINICA,23(5),1133-1140. |
| MLA | Zhang Jin,et al."Compositional features and P-T conditions of granulite xenoliths from Late Cretaceous mafic dike, Qingdao region".ACTA PETROLOGICA SINICA 23.5(2007):1133-1140. |
入库方式： OAI收割
来源：地质与地球物理研究所
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