2018
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11
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17
Mid-conference field trip
Mid-conference field trip:Cretaceous adakitic quartz diorite and sedimentations around Nanjing Time:Wednesday October 16th, 2019 Price: This mid-conference field trip is included in the registration fee. The mid-conference field trip will include excursions to the Anjishan pluton, the Upper Cretaceous Pukou Formation, and cultural heritage sites around Nanjing.The Anjishan pluton is located in the Ningzhen area of the Lower Yangtze region. It is composed of porphyritic granodiorite and quartz diorite. New LA-ICP-MS U–Pb zircon ages suggest that the Anjishan granodiorite formed at 108.8 ± 1.2 Ma (Liu JM et al., 2014, Geol. Rev.). The Anjishan rocks are characterized by geochemical features typical of adakitic rocks (i.e., high Mg#, Sr/Y, La/Yb, and low Y and Yb). These geochemical features suggest that the thickness of the crust in this area exceeded 40 km in the Early Cretaceous, which is greater than the present-day thickness of ~30 km. This indicates that the...