Advances in Earth Science
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WANG Jin-rong; ZHAI Xin-wei; BIAN Shao-zhi; LI Shuang-wen; DONG Ning-fang; WANG Ting-yin
WANG Jin-rong;ZHAI Xin-wei;BIAN Shao-zhi;LI Shuang-wen;DONG Ning-fang;WANG Ting-yin. ADVANCE IN THE STUDY OF THE EVOLUTION OF THE EARLY CRUST[J]. Advances in Earth Science, 2004, 19(4): 591-598.
The topic of the study of the evolution of early crust is to probe into the processes of early continental formation, growth, and recycling, and their geochemical and geophysical models. The debate upon the continental growth rate has been lasting for over 30 years due to the constraints of distribution of a very small amount of ancient rocks in the continental crust. Based on the knowledge of the continent extracted from the underlying mantle, and of relative depletion of the extracted mantle, geochemists have proposed many important models for the continental formation, growth, and recycling. With advances in geological chronology, especially in the recently developed MCICPMS which allows precise analysis of Hf grain by grain from a detrital zircon rather than in bulk, it can provide much more information and more reliable evidence for us to elucidate successfully the earliest history of the continental crust. The researches of geophysics and geochemistry of the crust and mantle in early Precambrian continental blocks show that the continental recycling, crustmantle interaction and intracrustal reworking (e.g . the remelting of significantly older crust and subsequently extensive mixing between the melts and relatively new crust) might have been important processes from earliest time.