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Marine Evaporative Genesis and Formation Age of Paleoproterozoic Borate Deposits, Eastern Liaoning Province: Constrains from Isotope Geochemistry
Author(s) -
HU Guyue,
LI Yanhe,
FAN Changfu,
HOU Kejun,
ZHAO Yue
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12384_8
Subject(s) - beijing , chinese academy of sciences , china , mineral resource classification , geology , geochemistry , library science , archaeology , geography , computer science
The North China Craton has been devided into Eastern and Western blocks, which developed independently during the Archean and collided along the Trans-North China Orogen during a Paleoproterozoic (~1.85 Ga) orogenic event (Zhao et al., 2012). The Eastern blocks underwent a Paleoproterozoic rifting (named Liaoji rift) epoch along its eastern continental margin in the period of 2.3–1.9 Ga (Zhai and Santosh, 2011), and a sequence of sedimentary-volcanic formation was formed at the same time, which hosts a large number of Mg and Mg-Fe borate deposits at the eastern Liaoning province, Northeastern China (Peng et al., 1995, 2002; Jiang et al., 1997). The Late Paleoproterozoic tectonothermal event (1.95–1.85 Ga) (Wan et al., 2006), which may be related to the amalgamation of the supercontinent Columbia, induced amphibole grade metamorphisms upon the boron-bearing sedimentary-volcanic stratums (Sun et al., 1993).Compare to the well know Neogene (or younger) borate deposits of Anatoli (Turkey) and California (USA),the borate doposits in Liaoning province are unusual for its unique Paleoproterozoic ore-forming epoch, and metamorphous mineral assemble types of ludwigite – szaibelyite and suanite – szaibelyite.