Late Miocene to Early Pliocene blueschist from Taiwan and its exhumation via forearc extraction
Late Miocene to Early Pliocene blueschist from Taiwan and its exhumation via forearc extraction
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台湾晚中新世至早上新世蓝片岩及其弧前剥露
作者：
Sandmann;Froitzheim;Ustaszewski;Münker
台湾中央山脉榆里带的蓝片岩相岩石记录了欧亚板块正在进行的俯冲。我们给出了尉犁带一块退变蓝片岩的前进型Lu-HF石榴石全岩年龄为5.1±11.7 Ma。这一年龄比之前推测的尉犁带高压变质作用年龄14-8 Ma要年轻得多，代表了有记录的蓝片岩相变质作用最年轻的Lu-HF石榴石年龄。这一年龄为了解尉犁带的古地理起源和折返情景提供了新的线索。我们认为，尉犁带起源于中国被动边缘的洋-陆边界。它在与吕宋岛弧碰撞过程中向东俯冲，当弧前岩石圈通过离散俯冲(提取)从大陆板块上方剥离时迅速折返。这一过程降低了大陆板块上方的压力，并可能促使俯冲地壳上升到开口缝隙中。因此，它可以控制高压岩石的折返。
Blueschist facies rocks in the Yuli Belt of Taiwan's Central Range record ongoing subduction of the Eurasian plate. We present a prograde Lu–Hf garnet–whole‐rock age of 5.1 ± 1.7 Ma from a retrogressed blueschist in the Yuli Belt. This age is considerably younger than the previously assumed age of 14–8 Ma for high‐pressure metamorphism in the Yuli Belt and represents the youngest Lu–Hf garnet age ever recorded for blueschist facies metamorphism. The age sheds new light on the palaeogeographic origin and exhumation scenario of the Yuli Belt. We propose that the Yuli Belt originated from the ocean–continent boundary of the Chinese passive margin. It was subducted eastward during collision with the Luzon island arc and rapidly exhumed when the forearc lithosphere was removed from above the continental slab by discrete subduction (extraction). This process reduces the pressure above the continental slab and may prompt the ascent of subducted crust into the opening gap. Thus, it can control the exhumation of high‐pressure rocks.
影响因子：
2.9
作者：
K. Ustaszewski;Yih‐Min Wu;J. Suppe;Hsin‐Hua Huang;Chien‐Hsin Chang;S. Carena
通讯作者：
K. Ustaszewski;Yih‐Min Wu;J. Suppe;Hsin‐Hua Huang;Chien‐Hsin Chang;S. Carena
DOI：
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发表时间：
1989
期刊：
影响因子：
--
作者：
T. Yui;C. Lo
通讯作者：
C. Lo
台湾东部玉里带塔马延混杂岩中含蓝闪石岩石的不同矿物成分、结构和变质 P-T 条件
DOI：
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发表时间：
2013
期刊：
影响因子：
--
作者：
Chin;Y. Iizuka;W. Ernst
通讯作者：
W. Ernst