Marc S. Hendrix, Gregory Arlen Davis's Paleozoic and Mesozoic tectonic evolution of central Asia: PDF

By Marc S. Hendrix, Gregory Arlen Davis

ISBN-10: 0813711940

ISBN-13: 9780813711942

Read Online or Download Paleozoic and Mesozoic tectonic evolution of central Asia: from continental assembly to intracontinental deformation, Nummer 194 PDF

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Extra resources for Paleozoic and Mesozoic tectonic evolution of central Asia: from continental assembly to intracontinental deformation, Nummer 194

Example text

1). Unfortunately, the UrumqiKorla Highway was sited along a generally low-relief route where outcrops are relatively poor for great distances, so that the ability to observe many structures and petrotectonic elements of the Tian Shan is rather limited. Thus, a study of the Du-Ku Highway section is essential for reconstruction of an amalgamation history that involved continental blocks, ocean basins, and magmatic arcs. , this volume). Although reconnaissance in nature, our study of the Du-Ku section incorporates all biostratigraphic and radiometric data available from published and unpublished reports (Wang Baoyu, 1994, unpublished data) and new 40Ar/39Ar ages obtained during this study.

However, Carboniferous strata of the Erbin Shan and Bayanbulak area are little deformed or metamorphosed and are 63 km thick in the area (proprietary 1:200 000 geologic mapping by Xinjiang Bureau of Geology and Mineral Resources). , this volume), preservation of Carboniferous carbonate strata would be extremely unlikely if exhumation was the sole cause of the Early Permian cooling from 350°C to 680°C. Thus, reheating by Early Permian Borohoro arc magmatism, followed by rapid cooling without significant exhumation, is a viable interpretation of thermochronologic relations in the Erbin Shan.

WMPA and IA are based on temperature steps and fraction of 39Ar listed in the last two columns. Location Sample No. TABLE 1. 40Ar/ 39Ar AGES OF SAMPLES FROM DU-KU TRANSECT, TIAN SHAN, NORTHWEST CHINA n/a 2–13/13 n/a 14–28/28 3–18/18 9–18/18 Steps n/a 84 n/a 39 88 81 %39Ar 38 D. Zhou et al. TABLE 2. RADIOMETRIC AGES OF PLUTONS ALONG THE SOUTHERN MARGIN OF THE CENTRAL TIAN SHAN BLOCK The radiometric ages listed in Table 4 apparently testify to subduction of oceanic crust from at least Late Silurian through Early Carboniferous.

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