中国，福建省のジュラ・白亜紀花こう岩類について

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  • Jurasso-Cretaceous granites in Fujian Province, China.
  • チュウゴク フクケンショウ ノ ジュラ ハクアキ カコウガンルイ ニ ツイテ

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1. On the basis of tectonic lines, geological features and crustal movements, Fujian Province is divided into the three geological districts : north-west uplift, south-west depression and east volcanic depression districts. There are 6 deep and large fault zones, four of which run north-east (Sinian direction) and two of which run north-west.<BR>2. Caledonian granites are mainly found in the north-west uplift district and Variscan-Indosinian granites in the south-west district, but Jurasso-Cretaceous (Yanshanian) granites distribute in all of the three districts. Thus, Jurrasso-Cretaceous granites are most prominent in Fujian Province throughout the whole of the geological age.<BR>3. It is remarkable that the Jurasso-Cretaceous granites are closely related to the four fault zones running north-east. The intrusive and volcanic rocks, derived from the same magma source, took place in the similar tectonic environment and formed polygenetic intrusions. The magmatism was most active in the late Jurassic period with four intrusions.<BR>4. Cretaceous granites, emplaced mainly in the east volcanic depression district, compose of many kind of rocks such as granite, granodiorite, quartz diorite, monzogranite and so on. The intrusion in the Cretaceous period took place four times with miarolite granite comming into being in the third intrusion, but their granites show the same absolute age of 100-80 Ma by radioactive isotopes.<BR>5. Miarolite granite runs north-east from Shantou in Guangdong Province through east Fujian Province to Zhoushan in east Zhejiang Provice, and then across the East China Sea to Masan in South Korea. This is one of the most remarkable features of the geological structure of East Asia.<BR>6. Details of the petrological characteristics of Fujian Province are described in the paper.

収録刊行物

  • 地学雑誌

    地学雑誌 99 (7), 733-742, 1990

    公益社団法人 東京地学協会

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