Journal
ACTA GEOLOGICA SINICA-ENGLISH EDITION
Volume 85, Issue 1, Pages 130-144Publisher
WILEY
DOI: 10.1111/j.1755-6724.2011.00385.x
Keywords
Late Mesozoic volcanic rocks; LA-ICP-MS U-Pb; compressional events; Wuyishan Belt; SE China
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Funding
- National Natural Science Foundation of China [40634022]
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Five volcanic rock samples and two granite samples taken from the volcanic basins in western Fujian and southern Jiangxi were dated by using the zircon laser albation-inductively coupled plasma mass spectrometry U-Pb method. Together with previously dated ages, the dates obtained provide important constraints on the timing of late Mesozoic tectonic events in SE China. The volcanic rock samples yield ages of 183.1 +/- 3.5 Ma, ca. 141 Ma to 135.8 +/- 1.1 Ma, 100.4 +/- 1.5 to 97.6 +/- 1.1 Ma, confirming three episodes of late Mesozoic volcanic activities, which peaked at 180 +/- 5 Ma, 140 +/- 5 Ma and 100 +/- 5 Ma, respectively, along the Wuyishan belt. Moreover, based on field investigations of these volcano-sedimentary basins, we have recognized two compressional tectonic events along this belt The early one was characterized by Upper Triassic to Middle Jurassic NNE-trending folds that were intruded by late Jurassic granites; and the late one caused the Lower Cretaceous volcano-sedimentary layer to be tilted. The dated age 152.9 +/- 1.4 Ma of the granitic samples from the Hetian granitic pluton in the Changting Basin and that from the Baishiding granitic pluton, 100.2 +/- 1.8 Ma, in the Jianning Basin, give the upper boundaries of these two tectonic events respectively. Hence, the late Mesozoic tectonic evolution of SE China was alternated between extension and compression.
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