Computer Science
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.161..215h&link_type=abstract
Earth and Planetary Science Letters, vol. 161, Issue 1-4, pp.215-230
Computer Science
81
Dabie Mountains, Zircon, Absolute Age, Sino–, Korean Platform, High Pressure, Orogenic Belt
Scientific paper
New SHRIMP and TIMS zircon ages, 40 Ar/ 39 Ar ages, and eclogite locations contribute significantly to our understanding of the ultrahigh-pressure Dabie Shan. (1) The geographic extent of the Yangtze craton that was subducted to ultrahigh pressure extends to the northern edge of the Dabie Shan. (2) The northern half of the Dabie Shan is a magmatic complex, intruded over a 10-Myr interval between 137 and 126 Ma, that accommodated ~100% N-S stretching of the pre-existing collisional architecture. (3) Granitic orthogneisses and enclosing ultrahigh-pressure paragneisses have indistinguishable zircon populations. The population of Triassic zircon ages ranges from ~219 to ~245 Ma, leading us to question the prevailing assumption that 219 Ma zircons formed at ultrahigh pressure, and to propose instead that they reflect late retrogression at crustal pressures following the bulk of exhumation.
Hacker Bradley R.
Ireland Trevor
Ratschbacher Lothar
Shuwen Dong
Walker Doug
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