EPMA U-Th-Pb monazite dating of metamorphic rocks from the Mogok Metamorphic Belt, central Myanmar
EPMA U-Th-Pb monazite dating of metamorphic rocks from the Mogok Metamorphic Belt, central Myanmar
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DOI：
10.2465/jmps.121019a
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发表时间：
2013-09
影响因子：
0.7
通讯作者：
Kazuhiro Yonemura;Y. Osanai;N. Nakano;T. Adachi;P. Charusiri;Tun Naing Zaw
中科院分区：
文献类型：
--
作者：
Kazuhiro Yonemura;Y. Osanai;N. Nakano;T. Adachi;P. Charusiri;Tun Naing Zaw
位于缅甸中部的莫谷变质带（MMB）包含一组高级变质岩，据信是在区域早始新世-渐新世变质事件期间形成的。我们在Mogok地区新发现了Grt-Opx麻粒岩，该麻粒岩在压力-温度（P-T）条件下形成，估计为6.5-8.7 kbar和800-950 °C。根据EPMA U-Th-Pb Mnz测年结果，贯穿MMB中部的Mogok、曼德勒和Meikthila地区具有始新世至渐新世变形和流体渗透事件的特征。此外，来自密铁拉和曼德勒地区的几个Mnz颗粒记录了晚三叠世（~ 200 Ma）和白垩纪（~ 80 Ma和110 Ma）地质事件的年龄。
The Mogok Metamorphic Belt (MMB), situated in central Myanmar, contains an assemblage of high-grade metamorphic rocks believed to have been formed during a regional Early Eocene-Oligocene metamorphic event. We newly found Grt-Opx granulite in the Mogok area, which was formed under pressure-temperature (P-T ) conditions estimated as being 6.5-8.7 kbar and 800-950 °C. Based on the results of EPMA U-Th-Pb Mnz dating, the central MMB, which runs through the Mogok, Mandalay, and Meikthila areas, is characterized by an Eocene to Oligocene deformation and fluid infiltration event. In addition, several Mnz grains from the Meikthila and Mandalay areas record ages of the Late Triassic (~ 200 Ma) and Cretaceous (~ 80 Ma and 110 Ma) geologic events.