中文摘要：

在P-T界线生物大灭绝事件以后的早三叠世早期，上扬子地区广泛沉积了低能环境纹层状微晶灰岩、灰质页岩或条带状灰岩沉积，代表了P—T事件之后早三叠世最早期上扬子地区所处的古特提斯海海洋循环的近乎停滞；该套低能环境静水沉积广泛见于江油、广元、旺苍、重庆等地剖面中。上覆于停滞海洋沉积之上的是角砾状灰岩、扁平砾石灰岩、丘状交错层理颗粒灰岩、沙纹层理粉砂岩等和风暴作用有关的动荡海水沉积；低能环境沉积与动荡海水沉积之间常见冲刷、侵蚀界面，这都反映了上扬子地区从停滞海洋到动荡海洋的地质记录。JIi西北地区角砾状灰岩分布面积大、成因特殊，而扁平砾石灰岩是早三叠世典型的与风暴作用有关的错时相灰岩。沉积岩石显示的从静水条件到与风暴有关的动荡水条件的环境变化，预示着早三叠世早期生物大灭绝以后不同寻常的古海洋和古气候变化。P—T生物大灭绝可能对早三叠世早期古气候和大气循环起到了显著作用，P—T事件后生物对整个地球系统的调节作用减弱，地球系统向极端情况发展的趋势将得不到有效制约，全球古环境与古气候可能因此变得极端恶劣。

英文摘要：

In upper Yangtze Region, laminated microcrystalline limestone, calcareous shale or ribbon limestone widely developed during the earliest stage of Early Triassic time, just after the Permian Triassic boundary （PTB） mass extinction, which represented the Sluggish oceanic circulation. As seen at the sections in Jiangyou, Guangyuan, Wangcang County, Sichuan Province and Chongqing Municipality, the storm-related sediments such as brecciform limestone, flat-pebble conglomerate calcirudyte, hummocky cross-bedding grain limestone, ripple bedding siltstone uplaped on the laminated or ribbon deposits. Erosion surfaces were usually seen between the low-energy deposits and the storm-related turbulent oceanic deposits, which indicated the unusual paleo-oceanographical and paleoclimate changes during the earliest stage of Early Triassic interval. As a main type of Early Triassic anachronistic facies which showed the turbulent oceanic conditions, brecciform limestone and flat-pebble conglomerate calcirudyte were widely seen in the northwestern part of upper Yangtze Region. It was considered that the PTB event dramatically affected the Early Triassic paleoclimate and atmospheric circulation. After the PTB mass extinction, the moderating effect caused by creature fell off and extreme palaeoenvironment and paleoclimate reigned over the Earth.