东南亚的泰国、老挝和马来西亚地区弥散性分布着众多微陆块、地块及类型多样的洋-陆或陆-陆/弧拼贴边界，保留有丰富的古特提斯演变地质记录。但是现有研究对上述不同微陆块或区块在晚古生代-早中生代时期的裂解与聚合过程仍处于描述阶段，对这些微陆块、区块间晚古生代期间的完整性、亲缘性及其洋-陆格局与洋盆持续时限等仍不清晰，对它们于何时、以何种方式汇聚并最终相互拼贴为一完整整体仍缺乏精细限定。该申请项目拟借助多学科和多技术手段综合研究东南亚泰老马地区晚古生代-早中生代时期众多微陆块或块体的构造重建及聚合过程。着重解决东南亚地区 (a)晚古生代不同微陆块或区块的构造归属和亲缘性、(b)晚古生代不同微陆块或区块的古位置及洋/弧-陆格局、(c)不同区块或拼贴带的构造背景及相互间聚合的精细时序、(d)众多拼贴带的汇聚方式及时空连接，以此阐明“东南亚晚古生代多块体构造重建及其聚合过程"这一关键科学问题。

Numerous geological relicts (e.g., mélange, ophiolite suite, oceanic basalts, radiolarian-bearing silicalite, high-pressure metamorphic rocks, blueschist and associated arc-magmatism) related to the Devonian to Triassic Paleotethyan evolution are abundantly preserved in the eastern segment of Eastern Paleotethyan domain in Southeast Asia besides South Tibet and SW Yunnan. These relicts provide a record of not only Paleotethyan subduction but also the subsequent collision of the Cimmerian blocks (Sibumasu/South Qiangtang) with Southeast Asia continental fragments (e.g., Simao, Indochina and South China blocks). Numerous structural, lithological, geochemical and geochronological data have been collected through East and Southeast Asia, yet key questions relating to “when and where” of the East Paleotethyan subduction remain in dispute. This hinders our full understanding of “how”; i.e., what are the fundamental geodynamic processes that drove this tectonic evolution. In detail, these questions are: (1) what suture zone represents the main closure boundary; (2) when did closure actually occur; and (3) what is the style of assembly of the Eastern Cimmerian and Southeast Asia continental fragments? In an attempt to change the above-mentioned research status, this proposal will focus on the Late Paleozoic-earliest Mesozoic tectonic reconstruction of Southeast Asia multi-fragments and East Paleotethyan consumption in Thailand, Laos and Malaysia, with an aim for answering the following key issues, involving (a) the tectonic affinity of the different microblocks or fragments in Southeast Asia; (b) tectonic setting of the related amalgamation boundaries and temporal patterns of the different fragments in Southeast Asia; (c) reconstruction of the palaeogeographic locations of the different microblocks or fragments and Late Paleozoic trench-basin system in Southeast Asia; (d) final closure time of Eastern Paleotethyan Ocean and amalgamation style and process of the different microblocks or fragments of the Sibumasu with Simao/Indochina Blocks in Southeast Asia. A new model for the tectonic evolution of the eastern segment of Paleotethyan Domain is expected to be proposed.