華南印支期之岩漿活動與大地構造演化研究（Ⅱ）
Date Issued
2005
Date
2005
Author(s)
陳正宏
DOI
932116M002038
Abstract
Darongshan granitic suites are the most
important and extensive Indosinian intrusive
rocks in the Cathaysia Block. Many previous
works, including field and dating studies,
show that these granites were formed at the
Hercynian-Indosinian periods. In order to
better constrain the exactly intrusive ages
and discuss their possible magma source,
zircons from Darongshan granitic suites are
separated for U-Pb age dating using the
LA-ICP-MS method. We report the zircon
U-Pb ages of granites from four batholiths of
Darongshan granitic suites (Taima, Jiuzhou,
Nadong and Pubai). Ages obtained are
255.3 ±2.9, 257.0 ±3.8, 259.7 ±3.1, 255.5 ±5.8
and 256.2 ±7.2 Ma, respectively, with the last
two from the same batholith of Pubai. The
data indicate that these granites are
Indosinian intrusives emplaced at a very
short period of time (260~255 Ma). However,
all these samples inevitably contain many
inherited zircons with ages ranging from
Mesoprotero- zoic to Early Paleozoic (mostly
Caledonian). Combined with the
geochemical results we reported last year, it
can be concluded that Darongshan granites
were generated from remelting of the
thickened (meta)sedimentary crust typical of
the S-type granites.
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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