Abstract
Discontinously exposed deep-water deposits in the Changning-Menglian belt, characterized by terrigenous turbidites, turbiditic marlstones, bedded radiolarian cherts, pelagic radiolarian shales, and some basaltic lavas and pyroclastic rocks, constitute a continous record of Palaeotethys evolution from early Devonian to middle Triassic, and strongly suggest that this belt is the main branch of the Palaeotethyan polyisland ocean in the Hercynian-Indosinian stage. According to the sedimentary history of the Changning-Menglian belt, the main basin of the Palaeotethys after opening for a long period narrowed markedly in the late permian but kept its typical oceanic environment until the end of middle Triassic. In the Lancangjiang belt, deep-water deposits occured mainly during the late Carboniferous to early Permian and are related to the island-arc volcanic activities. These deposits appear to be similar to those from the Petchabun belt of Thailand. Following the emergence of the Lincang magmatic arc in the studied area, which took place in mid-Permian times, the deep-water basin in the Lancangjiang belt between the Lincang and Simao massifs was closed, while the Palaeotethys main oceanic basin, represented by the Changning-Menglian belt to the west of the Lincang arc, hosted diverse pelagic sediments.
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