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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.

本文对新西兰二叠系—侏罗系增生杂岩的远洋—半远洋序列进行了野外地质调查，以明确地质体之间的相、结构、区系和地层相关性，并对高纬度放射虫动物群进行了时间表征。对北岛Whangaroa湾Arrow Rocks的二叠纪-三叠纪上层演替（Waipapa Terrane）的测量剖面进行了详细的对比。对可能的P/T边界层序进行了精细牙形石生物地层学研究。Kummeli, Ns。cristagalli, Ns。巴基斯坦和n.s。在箭岩发现了Waageni带。该剖面为早至中三叠世高纬度放射虫动物群提供了新发现。在Stephenson岛、Cavalli群岛、群岛湾的各个岛屿和Puketi森林的内陆部分，对Waipapa Terrane内不同年龄的高纬度放射虫进行了勘察搜索。在奥克兰地区，对Ponui岛半深海绿色泥质岩剖面的放射虫群分析表明，保存完好的侏罗纪高纬度放射虫群来自于磷酸盐固结。3 .通过放射虫分析，明确了Pakihi岛上层红燧石层序的三叠系-侏罗系界线。在俄罗斯莫斯科和乌里扬诺夫斯克地区进行了晚侏罗世至晚古新世含放射虫地层的对比调查，并收集了北纬不同时代的放射虫动物群。