青白口纪宏观藻类生物群及其古地理意义
The Qingbaikou Macroalgae Biota and Their Implications for Rodinia Reconstruction

Rodinia超级大陆演化作为前寒武纪重要科学问题，一直备受关注.古生物地理区系作为解决古板块地理位置重建的有效手段，在Rodinia超级大陆恢复方面应用较少.龙凤山生物群是新元古代早期宏观藻类代表性生物群之一，其以Chuaria-Tawuia-Longfengshania为组合特征的宏观藻类在新元古代早期(1000～780Ma)广泛分布在赤道及低纬度地区的温暖滨海静水环境中.根据全球现有可靠的生物群落资料，进行了古生物地理分析，结果表明：此时期宏观藻类可划分为一个赤道附近低纬度地区宏观藻类生物域，域内包括以含底栖固着Longfengshania为特征的华北-加拿大(Chuaria-Tawuia-Longfengshania)区和仅有简单浮游藻类为特征的扬子-印度(Chuaria-Tawuia)区；古生物地理分布特征表明青白口纪Rodinia超级大陆中华北板块与劳伦古陆相邻、位于超大陆东缘，而扬子克拉通靠近印度板块、位于超大陆西部.
The evolution of Rodinia surpercontinent has always been of concern as an important scientific issue. Paleobiogeographic region analysis, as an effective method to solve the problem of the tectonic reconstruction of the continental masses, has rarely been applied to Rodinia. Longfengshan biota, characterized by Chuaria-Tawuia-Longfengshania, is one of the typical biota, whose biotic factor can be found globally ,in the nearshore shallow water basin and Lagoon, Tonian. According to the reliable existing biota data reported globally, we make the paleobiogeographic analysis, zoning them into North China Craton-North Laurentia region(Chuaria-Tawuia-Longfengshania) and Yangtze Craton-India Craton region (Chuaria-Tawuia), constitute a low-latitude-Macroalgae realm (1000-780Ma). Furthermore, we have a new cognition on the position of North China Craton, in the east of Rodinia surpercontinent, near Laurentia Craton, and Yangtze Craton in the west，close to India Craton