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Trace element composition of peridotites from the southern Mariana forearc:Insights into the geochemical effects of serpentinization and/or seafloor weathering

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Chinese Journal of Oceanology and Limnology 2009年第4期27卷 985-992页

作者：汪小妹曾志刚刘长华陈俊兵殷学博王晓媛陈代庚张国良李康陈帅欧阳荷根 Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Graduate School of Chinese Academy of Sciences Geological Brigade of Hydrogeology and Engineering Geology Zhejiang Geological Prospecting Bureau

Peridotites from the southern Mariana forearc were sampled on the landward trench slope of the Izu-Bonin-Mariana (IBM) subduction zone by *** mantle wedge peridotites underwent hydration by fluid derived from a dehydrated descending slab,and later interacted with seawater after emplacement at or near the *** study investigates how these two different rock-fluid interaction processes influenced trace element distribution in the southern Mariana forearc *** measured trace element concentrations of peridotites from the southern Mariana *** southern Mariana forearc peridotites are characterized by a distinct seawater-like REE pattern with an obvious negative ce anomaly,and La shows good correlation with other REEs (except ce).In addition,there is a great enrichment of U,Pb,Sr and Li elements,which show a distinct positive anomaly relative to adjacent elements in the multi-element *** the seawater-like REE pattern,we infer that REEs are mainly influenced by seawater during peridotite-seawater interactions after their emplacement at or near the seafloor,by serpentinization or by marine ***,the anomalous behavior of ce,compared with other rare earth elements in these samples,may indicate that they have undergone reactions involving ce (IV) when the peridotites interacted with *** U,Pb,Sr and Li anomalies are inferred to be related to seawater and/or fluids released during dehydration of the subducting slab.

关键词： peridotites forearc Mariana element negative ce anomaly

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Petrologic and REE Geochemical Characters of Burnt Rocks

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Acta Geologica Sinica(English Edition) 2008年第2期82卷 392-398页

作者： HUANG Lei LIU Chiyang YANG Lei ZHAO Junfeng FANG Jianjun State Key Laboratory of-Continental Dynamics （Northwest University）~Institute of Petroliferous Basin of Northwest University Xi＇ an Shaanxi 710069

The study of burnt rocks is beneficial to the discussion on the tectonic movement, paleoclimate and paleogeography that coal seams are subjected to after they were formed. In order to obtain the basic data on the features of the burnt rocks, a systematic study of petrology and REE geochemistry on burnt rocks in Shenmu, Northern Shaanxi Province has been done, using the methods of SEM, EDS, susceptibility measurements and ICP-MS. The burnt rocks are divided into two series in the section： the melted rocks and the baked rocks. SEM and EDS analyses reveal that all the minerals show burnt and melted traces, and there are no clay minerals except illite found in the burnt rocks. Susceptibility measurements reveal that the burnt rocks have abnormally high susceptibility values, whereas a geochemical analysis shows that the REE distribution pattern of burnt rocks is similar to that of sedimentary rocks （initial rocks）. In the longitudinal section, with increasing degree of burning （from baked rocks to melted rocks）, the ∑REE gradually decreases, and the total REE of melted rocks is obviously lower than that of baked rocks. Besides, the melted rocks show apparent negative ce anomalies, while the baked rocks show no anomaly of ce, and sometimes even show positive anomalies.

关键词： burnt rock mineral petrology susceptibility REE negative ce anomaly

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