Crack and assembly events of Meso-Neoproterozoic-Palaeozoic continental blocks in the sourthern area of Suzuoqi, Inner Mongolia

Authors
Citation
C. Zhang et Tr. Wu, Crack and assembly events of Meso-Neoproterozoic-Palaeozoic continental blocks in the sourthern area of Suzuoqi, Inner Mongolia, ACTA PETR S, 17(2), 2001, pp. 199-205
Citations number
12
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
ACTA PETROLOGICA SINICA
ISSN journal
1000-0569 → ACNP
Volume
17
Issue
2
Year of publication
2001
Pages
199 - 205
Database
ISI
SICI code
1000-0569(200104)17:2<199:CAAEOM>2.0.ZU;2-4
Abstract
Ondor Sum Group is situated in the southern area of Suzuoqi, Inner Mongolia , which is divided into Baoyintu Group of Early Proterozoic era(1911Ma simi lar to 1708Ma), Ondor Sum Group of Meso-Neoproterozoic era(1511Ma similar t o 826Ma), and ophiolitic melange of Early Paleozoic era based on rock assoc iation, nature of chemical petrology and isotopic age. Baoyintu Group is re cognized as an ancient fragment from crystalline basement in stage of conti nental margin disjoined. Ondor Sum Group of Meso-Neoproterozoic and oceanic crust association consists of ultrabasic rock, basic Volcanic rock and sil icilith interpreted as extended transition crust during continental margin extension disjoined in Meso-Neoproterozoic era to Early Paleozoic. This reg ion's tectonic regime transformed from extension to compression in late Ear ly Paleozoic to early Upper Paleozoic. Ophiolitic melange belt and large am ont of altered diorite, tonalite, granodiorite, monzonitic granite and kali granite could be interpreted as compression type transition crust during co mpression in Upper Paleozoic.