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Petrology of Blueschists of Heilongjiang Complex in Northeast China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2010年第02期
Page:
111-119
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Petrology of Blueschists of Heilongjiang Complex in Northeast China
Author(s):
N I Volkova1;  LI You-zhu2
(1.Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia; 2.School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
blueschist;  petrology;  Heilongjiang Complex;  OIB;  E-MORB
PACS:
P588.3
DOI:
-
Abstract:
The Heilongjiang Complex contains blueschists composing of epidote, chlorite, albite, sodic amphibole, phengite, quartz, with minor amounts of titanite, ilmenite, and stilpnomelane. Sodic amphiboles are glaucophane to magnesioriebeckite. The Pressure(P)-Temperature(T)metamorphic conditions are estimated to be 400-425 ℃ and 0.69-0.86 MPa, which correspond to epidote-blueschist facies. Geochemical study of blueschists from the Heilongjiang Complex showed that their protoliths were oceanic basalts, which were comparable with oceanic island basalt(OIB)or some types of basalts from plume-influenced regions(E-MORB). This suggests the formation of basalt protolith of the Heilongjiang blueschists from enriched source in seamount or oceanic uplift setting. The presence of metabasalts with geochemical features typical of ocean island basalts, as well as Mn-rich metacherts, marbles, metagraywackes and ophiolite slices, indicates that the Heilongjiang Complex is a subduction-accretionary complex, containing fragments of deformed oceanic crust and rocks of an accretionary wedge, which was formed at the western part of reworked Pre-Sinian Jiamusi Massif in the Jurassic. The complex is comparable in protolith compositions with many accretionary complexes of active continental margins.

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Last Update: 2010-06-20