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华南上扬子区晚奥陶世赫南特贝动物群的时空演变

, PP. 1154-1163

Keywords: 赫南特期,观音桥组,赫南特贝动物群,华南扬子区

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Abstract:

?赫南特贝动物群是奥陶纪末大灭绝事件第一幕发生之后,在全世界中、低纬度地区正常浅海底域广泛兴起的一个典型的凉水腕足动物群,已知在全世界除澳洲以外的各大洲数十个国家和地区见诸报道.华南上扬子区是赫南特贝动物群最为发育、分布最广泛、地质延限最长、生态分异最复杂的地区.定性与定量分析显示,赫南特贝动物群在扬子区从近岸至远岸的一系列产地,首现层位逐渐升高,动物群延续时限越来越短,而多样性却越来越高.纵向考察表明,近岸产地的赫南特贝动物群多样性由高向低演变,而远岸较深水产地的多样性演变则由低而高.随地点和层位而发生的环境因子变化(如水深、底质等),赫南特贝动物群应对以不同的群落、亚群落或群集.

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