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- W1640695035 abstract "There are a lot of ultramafic bodies in Sulu ultrahigh pressure metamorphic belt and the research on the origin of these rock bodies has long been a hot topic. To identify if there is the ultramafic rocks that experienced shallow crustal process before subduction in this terrane, this study carried out oxygen extraction from mineral separates olivine, garnet and clinopyroxene of three peridotite samples between the depths 603. 20 -683. 53m of Chinese Continental Scientific Drilling (CCSD) bore hole using CO2 laser fluorination system and isotope analysis by mass spectrometer. The results are as follows.δ18O values of olivine are +3. 31‰- + 3. 82‰, garnet + 4. 03‰- +4. 10‰, and clinopyroxene +2. 10‰in average with larger error. Theδ18O values of these mineral separates are comprehensively lower than typical mantle values. Combined with other evidences, it is indicated that the lowδ18O values of ultramafic rock in shallow crust level was got from interaction between heated cold meteoric water and the rock body and experienced afterwards subduction, UHPM, retrogressive metamorphism during exhumation etc together with wall-rocks. This is the first case that the ultramafic rocks possess aaaaaaaa 18O depleted character found in Sulu terrane. This result bears even more important continental dynamic meaning and proves that Sulu terrane is the eastward extension of Dabie terrane in respect of ultramafic rocks." @default.
- W1640695035 created "2016-06-24" @default.
- W1640695035 creator A5000192547 @default.
- W1640695035 date "2006-01-01" @default.
- W1640695035 modified "2023-09-24" @default.
- W1640695035 title "Magmatic ultramafic rock in Sulu ultrahigh pressure metamorphic belt: depleted oxygen isotope evidence from main hole of Chinese Continental Scientific Drilling Project." @default.
- W1640695035 hasPublicationYear "2006" @default.
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