日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 S (固体地球科学) » S-IT 地球内部科学・地球惑星テクトニクス

[S-IT23] Structure and Dynamics of Earth and Planetary Mantles

2019年5月26日(日) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:中川 貴司(香港大学地球科学専攻)、芳野 極(岡山大学惑星物質研究所)、趙 大鵬(東北大学大学院理学研究科附属地震・噴火予知研究観測センター)

[SIT23-P03] The distribution of Cenozoic conglomerates and its sedimentological constraint on the uplift of the South Tianshan, NW China

*SUN HAITAO1 (1.China University of Petroluem-Beijing)

キーワード:Cenozoic, Central Asian Orogenic Belt, Conglomerate

The Cenozoic alluvial fan deposits in the Kuqa Depression of Tarim Basin, likely in response to a tectonic event, can provide critical evidence for constraining the timing of the South Tianshan uplift and reconstructing the paleotectonic evolution of the Central Asian Orogenic Belt. The sedimentological analysis shows that the conglomerates were deposited in alluvial fan environment. The initial uplift stage was started from the Jidike Formation at ~23Ma, resulting only small but angular gravels. Then the rapid uplift was since 15.97 Ma leading to the deposition of Kangcun conglomerate layers. And the next rapid and intensely uplift was started at ~4 Ma of the deposition of Kuqa Formation, according to ~2000m thick alluvial fan conglomerates. After a short quiescence, the most remarkable uplift of South Tianshan regenerated and caused the most extensive alluvial fan conglomerates of Xiyu Formation since 2.58 Ma and continuing to the present.