%0 Journal Article
%T Petrology and mineralogy of PP3 ultramafic rocks in Sulu UHP belt and its significance<br>大陆科学钻探CCSD-PP3钻孔超镁铁岩岩石学和矿物学特征及其意义
%A CHEN ShiZhong
%A YANG JingSui
%A XU ZhiQin
%A LI TianFu
%A CHEN FangYuan
%A ZHANG ZhongMing
%A ZHANG WenLan Laboratory of Continental Dynamics
%A <br>陈世忠
%A 杨经绥
%A 许志琴
%A 李天福
%A 陈方远
%A 张仲明
%A 张文兰
%J 岩石学报
%D 2005
%I 
%X Ultramafic rocks about 480 metres sandwiching eclogite are revealed, which include garnet peridotite, dunite, serpentinite and few hargzburgite and amphibole phlogopite peridotite, contain olivine, chromium spinel, diopside, endiopside, or/and garnet, orthopyroxene, amphibole and phlogopite. Olivines have forsterite contents ranging from 88.7 to 93. 1, SiO2 ranging from 38. 8wt. % to 42. 4wt. % . All garnets ( Py65.945 Alml8.095 Uv7.518 Gr4.695 And3.605 Sp0.142 ) are pyropic, with CaO between 5.4 to 6.4 wt. % , and Cr2 O3 from 0. 3 to 3. 3 wt. % , represent early stage of mineral assemblage. Orthopyroxenes ( En91.8 Fs7. 9 Wo0.25 ) are unzoned, Cr2O3 ranges from 0 to 0. 32wt. % , and CaO ranges from near detection limit to 0. 20wt. %. Most of the Orthopyroxenes (the average is 0. 72wt. % ) have Al2O3 < 1. 1wt. %. Composition of clinopyroxenes in PP3 ultramafic rocks is attributed to two generations. the early generation is called diopside ( Wo45. 98 En47.89 Fs2.73 Ac3.39 ) and the later is endiopside(Wo27.61 En68.78 Fs2.27 Ac1.34) with higher MgO. Chromite in PP3 ultramafic rocks is compositionally variable, Cr#( molarlOOCr/( Cr Al) ) varies from 51 to 89, and TiO2 and MnO2 are lower than 0. 26wt. % and 0. 46wt. % respectively. Olivines, chromites, and clinopyroxenes show multistage, which were associated with partial melting, subduction and exhumation.
%K Garnet
%K Peridotites
%K Diopside
%K Chromium spinel<br>石榴橄榄岩
%K 榴辉岩
%K 透辉石
%K 铬尖晶石
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=25CB50826FB54A55&yid=2DD7160C83D0ACED&vid=659D3B06EBF534A7&iid=0B39A22176CE99FB&sid=F7BB24011DC0D223&eid=A7AE820C12CC9AD3&journal_id=1000-0569&journal_name=岩石学报&referenced_num=5&reference_num=31