PALEOCENE RADIOLARIANS FROM XENOLITHS HOSTED IN HOLOCENE LAVAS OF LANZAROTE (CANARY-ISLANDS)

被引：10

作者：

BUSTILLO, MA

NISHIMURA, A

ARANA, V

HATTORI, I

机构：

[1] Dpto. de Geologia. Museo Nacional de Ciencias Naturales (CSIC). Cl Jose Gutierrez Abascal

[2] 390-02, 3212 Satoyamabe, Matsumoto, Japan

[3] Dpto. Volcanologia, Museo Nacional de Ciencias Naturales (CSIC). Cl Jose Gutiérrez Abascal

[4] Geological Laboratory, Fukui University, Fukui

来源：

GEOBIOS | 1994年 / 27卷 / 02期

关键词：

RADIOLARIANS; LATE PALEOCENE; XENOLITHS IN LAVAS OCEANIC CRUST; CANARY-ISLANDS;

D O I：

10.1016/S0016-6995(94)80005-7

中图分类号：

Q91 [古生物学];

学科分类号：

0709 ; 070903 ;

摘要：

Paleocene radiolarian assemblages from siliceous metasedimentary xenoliths hosted in some historic lava flows of Lanzarote (Canary Islands) are analyzed. A thermal metamorphism transformed the radiolarians and they are now composed of cristobalite, calcite, quartz, or wollastonite 2M. In spite of the poor preservation, both Spumellaria and Nassellaria specimens have been identified. The radiolarian assemblages found can be correlated with the B. campechensis Zone of the late Paleocene. These radiolarian bearing rocks cover an important hiatus in the sedimentological record of the Northwest African Margin. The abundance of radiolarians during this time can be explained by upwelling. The location of Lanzarote on the oceanic slope of the Tarfaya-Aiun basin, and the topography created by submarine volcanism are two conditions that can lead to the existence of upwelling.

引用

页码：181 / 188

页数：8

共 18 条

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