|
|
|
篇目详细内容 |
|
【篇名】 |
Petrochemistry of peridotites from North China: Significance for lithospheric mantle evolution |
|
【刊名】 |
Frontiers of Earth Science in China |
|
【刊名缩写】 |
Front. Earth Sci. China |
|
【ISSN】 |
1673-7385 |
|
【EISSN】 |
1673-7490 |
|
【DOI】 |
10.1007/s11707-007-0006-5 |
|
【出版社】 |
Higher Education Press and Springer-Verlag |
|
【出版年】 |
2007 |
|
【卷期】 |
1
卷1期 |
|
【页码】 |
37-43
页,共
7
页 |
|
【作者】 |
ZHENG Jianping;
YU Chunmei;
YUAN Xiaoping;
YIN Li;
JIAO Shujuan;
TANG Huayun;
ZHANG Zhihai;
LU Fengxiang;
|
|
【关键词】 |
peridotite; petrochemistry; mantle replacement; eastern North China block |
【摘要】 |
|
A petrochemical analysis was undertaken of peridotitic xenoliths in volcanic rocks that erupted from the Paleozoic to the Cenozoic within the eastern part of the North China craton, and the peridotites as tectonic intrusion in the Early Mesozoic from the Sulu orogen. The results show that the cratonic mantle, which was refractory and existed when the kimberlites intruded in the Paleozoic, had almost been replaced by the newly accreted fertile lithospheric mantle during the Mesozoic-Cenozoic. The erosion, metasomatism, and intermingling caused by the accreted asthenospheric material acting on the craton mantle along the weak zone and deep fault (such as the Tanlu fault) in the existing lithosphere resulted in the lithospheric thinning at a larger scale 100 Ma ago (but later than 178 Ma). The largest thinning would be in the Eogene. The upwelling asthenospheric material transformed into accreted lithospheric mantle due to the asthenospheric temperature falling in the Neogene (leading to relatively slight lithospheric incrassation), and finally accomplished mantle replacement. The peridotitic body in the Sulu orogen represents the products spreading from the modified cratonic lithospheric mantle. |
|
