華南燕山早期花崗岩之岩漿活動研究（Ⅰ）
Date Issued
1998
Date
1998
Author(s)
陳正宏
DOI
872116M002012
Abstract
Large area of south China is intruded by
the Yanshanian granites (Jurassic-Cretaceous).
In spatial, these granites
developed mainly in the belts of two
directions, from northeast to southwest and
nearly the west to east. The genesis of these
granites may be the key of understanding the
crustal evolution and tectonic process during
the Mesozoic in south of China. We focus
our project of 1997-1998 on the early
Yanshanian granites in the northern and
southwestern area of Guangdong province,
particularly the NE-SW granite belts and E-W-
trending granite belts. The E-W granite
belts we studied are as follows, Jiufeng-Zhuguangshan-
Youshan granite belt (JZYB),
Dadongshan-Guidong-Jiulianshan granite
belt (DGJB), Lianyang-Fogang-Xinfengjiang-
Luofuxu granite belt (LFXLB)
and Xinxing-Heshan granite belt (XHB). The
NE-SW-trending granite belts we studied are
Tangkou-Xinxing granite belt (TXB) and
Taishan-Zengcheng granite belt (TZB). Two
types of granites, amphibole-granite and
biotite-granite, dominate both of these two
direction belts. The major elements
geochemistry of the granites these two types
is characterized by high potassic series rather
than the calc-alkaline series. This implies that
the origin of granites of early Yanshanian is
related to the extension tectonic setting but
not the conversion one. It suggests that the
uplifting of the margin of southeastern
mainland of China during early Yanshanian
may cause the formation of large granites, but
not the traditional view of the subduction of
Pacific plate beneath Euro-Asia continent.
Subjects
granites
Early Yanshanian
Magmatism
Magmatism
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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