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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.

对新西兰增生杂岩的二叠纪-侏罗纪远洋-半远洋序列进行了地质野外工作，以澄清地体之间的相、结构、动物群和地层对比，并描述了高纬度放射虫动物群的时间特征。对北岛旺格罗亚湾Arrow Rock出露的二叠纪-三叠纪远洋演替(Waipapa Terrane)的测量剖面进行了详细的对比。对可能的P/T界线层序进行了牙形刺生物地层学研究，发现下三叠统为南北向的4个带。库梅利，NS。克里斯加利，NS。Pakistanensis和NS.在Arrow Rock，人们已经认识到瓦格尼带。新发现了早中三叠世高纬度放射虫动物群。在斯蒂芬森岛、卡瓦利群岛、群岛海湾的各个岛屿和普凯蒂森林的内陆部分，对Waipapa Terrane内不同年代的高纬度放射虫进行了侦察搜索。在奥克兰地区，波努伊岛半深海绿色泥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来自磷酸盐结核。进行了放射虫分析，厘清了巴基岛远洋红色硅质岩层序中三叠系-侏罗系界线。以南部高纬度放射虫动物群为对照，对俄罗斯莫斯科和乌里扬诺夫斯克地区晚侏罗世-晚古新世含放射虫地层进行了调查，采集了不同时代的北部高纬度放射虫动物群。