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Newly Discovered Fluvial‐Lacustrine Sediments in the Western Yangtze Block and their Geological Significance for the Emeishan Large Igneous Province
Author(s) -
MABI Awei,
ZHANG Mingchun,
YANG Zhengxi,
LI Yanlong,
WEN Dengkui,
LIU Xuyang
Publication year - 2017
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13135
Subject(s) - china , mineral resource classification , geology , chinese academy of sciences , zhàng , geochemistry , large igneous province , yangtze river , mining engineering , archaeology , earth science , geography , tectonics , paleontology , magmatism
The Emeishan large igneous province (ELIP) in SW China is the only one large igneous province in China recognized by international geologists. Previous studies of ELIP over past two decades indicate that the ELIP age, duration, scale and generation mechanism are still controversial. Among those scientific topics, some scholars suggest that ELIP is an example of up-doming prior to LIP formation, which was evidenced by: (1) The thickness of the Yangxin Formation (P2y) limestone unit, which lies directly beneath ELIP, reduces from the center of erosional area to the outer edge. (2) Paleo-karst surfaces are present. (3) The clastic rocks of alluvial fan deposits, from the eroded materials in the maximum uplifted area, developed surrounding the inner zone. However, other scholars urge that those so-called “alluvial fan” deposits are “hydromagmatic deposits”, erupted or emplaced at or near sea level, and conclude that there was no pre-eruptive uplift in ELIP. In order to constrain the above-mentioned scientific issue, we conducted detailed field geological investigations and systematically measured geological sections to provide new evidence by using sedimentary data.