华北西部孔兹岩带深熔作用与S型花岗岩成因

本项目以华北孔兹岩带泥质麻粒岩和S型花岗岩为研究对象，深入研究其变质深熔/部分熔融作用与S型花岗岩的成因机制。通过计算孔兹岩在MnNCKFMASHTO或NCKFMASHTO体系下的P-T、T-X、P-X视剖面图，模拟其变质演化过程，深熔作用产生温压、熔体的含量和比例以及发生的变质反应。通过S型花岗岩的主微量和同位素分析判别其成因及其大地构造环境。结合锆石U-Pb体系SHRIMP或者SIMS定年技术，SIMS O同位素测定及LA-ICPMS-MC Lu-Hf同位素分析，多手段相结合研究以确定孔兹岩带变质深熔作用机理及S型花岗岩的成因联系和形成时代，分析其形成的大陆动力学背景，为正确认识华北克拉通西部陆块孔兹岩带的成因及演化提供必要的限定。

This proposal will focus on pelitic granulite and S-type granite from the Khondalite Belt of the North China Craton in order to discuss the metamorphic anatexis/partial melting and origin of the S-type granite. On the basis of MnNCKFMASHTO and/or NCKFMASHTO system, the P-T, T-X and P-X pseudosections will model the P-T metamorphic evolution of khondalites, P-T condition of metamorphic anatexis/partial melting, amount and proportion of melting and metamorphic reaction. Meanwhile, this proposal will carry out the major element, trace earth element and Sr-Nd isotopes of S-type granites to discuss the origin and tectonic setting. Taken together in suit zircon SHRIMP or SIMS U-Pb dating, SIMS O and LA-ICPMS-MC Lu-Hf isotopic analysis, the results of this proposal will not only determine the timing, tectonic processes and linking between metamorphic anatexis/partial melting of khondalites and the formation of S-type granite, but will also lead to improvements in understanding tectonic processes of the Khondalite Belt of the North China Craton during Paleoproterozoic time.