ND AND SR ISOTOPIC STUDY OF THE BAY OF ISLANDS OPHIOLITE COMPLEX AND THE EVOLUTION OF THE SOURCE OF MIDOCEAN RIDGE BASALTS

被引：205

作者：

JACOBSEN, SB

WASSERBURG, GJ

机构：

来源：

JOURNAL OF GEOPHYSICAL RESEARCH | 1979年 / 84卷 / NB13期

关键词：

D O I：

10.1029/JB084iB13p07429

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The time of crystallization of the complex is 508 + or - 6 m.y. and 501 + or - 13 m.y. using two Sm/Nd mineral isochrons from gabbros of the Blow-me-Down massif. This is the time of formation of this bit of former Iapetus oceanic crust. K/Ar ages show it was obducted 470 m.y. ago. The LIL and isotopic data show the rocks are oceanic. The variable Sr- but constant Nd-isotopic values indicate major interaction with sea-water, and show that early Palaeozoic ocean-floors were important sinks for radiogenic crustal Sr.M.J.Le B.

引用

页码：7429 / 7445

页数：17

共 120 条

[1]

Ahrens T. J., 1973, Physics of the Earth and Planetary Interiors, V7, P167, DOI 10.1016/0031-9201(73)90008-3

[2] K-AR AGES OF AMPHIBOLES FROM BAY OF ISLANDS OPHIOLITE AND LITTLE-PORT COMPLEX, WESTERN NEWFOUNDLAND, AND THEIR GEOLOGICAL IMPLICATIONS [J].