RECOVERY OF FORAMINIFERA FROM THE LATE CRETACEOUS CENOMANIAN-TURONIAN MASS EXTINCTION IN GAMBA, SOUTHERN TIBET
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Abstract:
Detailed sampling was made from the Zongshan section in Gamba, southern Tibet. These samples yield increasingly diversified foraminifers, totalling 130 species assigned to 52 genera. The main task of our research is to reveal the law of foraminiferal recovery from the global Cenomanian Turonian boundary event (CTBE). After the study of the change of diversity, abundance and structure of foraminiferal faunas, three phases of the foraminiferal evolution have been recognized during the latest Cenomanian to Santonian. They include a survival phase (Early Turonian), a recovery phase (middle late Turonian) and a radiation phase (Coniacian Santonian). Foraminiferal recovery after the CTBE in Gamba belongs to a gradual recovery, which is presumably caused by the change of dissolved oxygen content in oceanic water column.
