Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite 40Ar/39Ar Thermochronology
Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite 40Ar/39Ar Thermochronology
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黑云母 40Ar/39Ar 热年代学约束下中新世东部构造构造的热演化
DOI：
10.1086/682951
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发表时间：
2014-12
影响因子：
1.8
通讯作者：
Baofu Han
中科院分区：
文献类型：
--
作者：
Junfeng Gong;Jianqing Ji;Jing Zhou;Jiyao Tu;Dongxia Sun;Dalai Zhong;Baofu Han
我们在喜马拉雅造山带东部和邻近的中生代和早新生代冈底斯岩基带开展了黑云母 40Ar/39Ar 热年代学研究，旨在探讨喜马拉雅造山带偏远地区的整体冷却模式和热演化。我们新获得的年龄与现有数据的汇编揭示了一种新的时空模式。首先，研究区的冷却历史中存在13~7Ma的时间间隙，结结构内年龄<7Ma，冈底斯带年龄>13Ma。这个间隙可能是自 7 Ma 以来在缓慢冷却的一般区域内重新快速冷却的表现。其次，冷却年龄的等时线呈环状，年轻化趋势为7-4 Ma和4-2 Ma构造带核心的南迦巴瓦-甲拉佩里峰，以及2-1 Ma构造带边缘的年轻化趋势。这种模式可能是从结构的边缘到核心的区域性渐进冷却的结果，其间断是局部集中的加速冷却和折返。我们的新发现表明，边界构造的新生代断层控制了构造的发展。此外，对挖土速率的新估计表明，自 7 Ma 以来，构造结构的发展一直在加速。
We conducted biotite 40Ar/39Ar thermochronological research in the eastern Himalayan syntaxis and the neighboring Mesozoic and early Cenozoic Gangdese batholith belt with the aim of exploring the overall cooling pattern and thermal evolution of this remote region in the Himalayan orogen. A compilation of our newly acquired ages with existing data reveals a new temporal-spatial pattern. First, a temporal gap at 13–7 Ma exists in the cooling history of the study area, with ages <7 Ma within the syntaxis and ages >13 Ma in the Gangdese belt. The gap could be a manifestation of a renewed rapid cooling of the syntaxis since ∼7 Ma within a general region of slow cooling. Second, the isochron contours of the cooling ages have an annulus shape, with a younging trend toward the Namche Barwa–Gyala Peri peaks at the core of the syntaxis at 7–4 and 4–2 Ma and along the margins of the syntaxis at 2–1 Ma. This pattern may be a result of a regionally progressive cooling from the margin to the core of the syntaxis that was punctuated by locally focused accelerated cooling and exhumation. Our new findings imply that the Cenozoic faults bounding the syntaxis controlled the development of the syntaxis. Additionally, new estimates of the exhumati rate suggest that the development of the syntaxis has been accelerating since 7 Ma.
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