Origin and evolution of the Mesozoic high latitude radiolarian faunas in New Zealand and Russia

新西兰和俄罗斯中生代高纬度放射虫动物群的起源和演化

基本信息

批准号：
12575001
负责人：
AITA Yoshiaki
金额：
$ 9.92万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The geological fieldwork for the Permian-Jurassic pelagic to hemipelagic sequences of the accretionary complexes in New Zealand has been carried out to clarify the facies, structure and faunal and stratigraphic correlations between terranes and characterize high latitude radiolarian faunas through time.1. A detailed correlation of the measured sections within the Permian-Triassic pelagic succession (Waipapa Terrane) exposed at Arrow Rocks, Whangaroa Bay, North Island has been carried out. A refined conodont biostratigraphy for possible P/T boundary sequence revealed that the Lower Triassic 4 Zones, Ns. Kummeli, Ns. cristagalli, Ns. pakistanensis, and Ns. Waageni Zones have been recognized at Arrow Rocks. A new discovery of the Early to Middle Triassic high latitude radiolarian faunas has been made from this section.2. Reconnaissance search for high latitude radiolarians in various ages within Waipapa Terrane has been carried out on Stephenson Island, the Cavalli Islands, various islands of Bay of Islands, and inland sections of Puketi Forest.3. In Auckland area, radiolarian analysis from the hemipelagic green argillite section on Ponui Island indicates that well-preserved Jurassic high latitude radiolariaan faunas occurred from phosphatic concretions. Radiolarian analysis to clarify the Triassic -Jurassic boundary within the pelagic red cherts sequence on Pakihi Island has been carried out.4. In comparison with southern high latitude radiolarian faunas, the counter part of the Late Jurassic to Late Paleocene radiolarian-bearing strata in the Moscow and Ulyanovsk region in Russia has been surveyed and northern high latitude radiolarian faunas in different ages have been collected.

对新西兰二叠纪-侏罗纪增生杂岩的远洋到半远洋层序进行了野外地质调查，以阐明地体之间的相、结构以及动物和地层的相关性，并描述高纬度放射虫动物区系随时间的变化特征。1．已经对北岛旺格罗阿湾箭岩暴露的二叠纪-三叠纪远洋层序（怀帕帕地体）内的测量剖面进行了详细的对比。对可能的 P/T 边界序列进行的精细牙形刺生物地层学显示，下三叠统 4 区，Ns。库梅利，Ns。克里斯斯塔加利，Ns。巴基斯坦，和 Ns。瓦吉尼区 (Waageni Zone) 已在箭岩 (Arrow Rocks) 获得认可。本剖面对早三叠世至中三叠世高纬度放射虫动物群有了新的发现。 2．在史蒂芬森岛、卡瓦利群岛、群岛湾各岛以及普凯蒂森林内陆地区，对怀帕帕地体内不同年代的高纬度放射虫进行了勘察。 3．在奥克兰地区，对波努伊岛半远洋绿色泥质岩剖面的放射虫分析表明，保存完好的侏罗纪高纬度放射虫动物群是由磷酸结核形成的。对Pakihi岛中上层红燧石层序内的三叠系-侏罗系边界进行了放射虫分析。 4．与南方高纬度放射虫动物群相比，对俄罗斯莫斯科和乌里扬诺夫斯克地区晚侏罗世至晚古新世放射虫地层进行了对应调查，收集了不同时代的北方高纬度放射虫动物群。