Timing of diagenesis and very low-grade metamorphism in the eastern sector of the Sierra de Cameros (Iberian Range, Spain): a U-Pb SHRIMP study on monazite

被引：16

作者：

Del Rio, P. ^{[1
]}

Barbero, L. ^{[1
]}

Mata, P. ^{[1
]}

Fanning, C. M. ^{[2
]}

机构：

[1] Univ Cadiz, Fac Ciencias Mar & Ambientales, Dpto Ciencias Tierra, Cadiz 11051, Spain

[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia

来源：

TERRA NOVA | 2009年 / 21卷 / 06期

关键词：

AUTHIGENIC MONAZITE; XENOTIME; GEOCHRONOLOGY; ALLANITE; ZIRCON; BASIN; MUDROCKS; MINERALS; APATITE; DEPOSIT;

D O I：

10.1111/j.1365-3121.2009.00900.x

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Sierra de Cameros is an intracontinental orogen and represents the north-western part of the Iberian Range in Northern Spain. It comprises a thick sequence of syn-rift continental sediments (mainly sandstones and carbonates) deposited during lower Cretaceous times. A unique characteristic of the Sierra de Cameros in relation to the rest of the Iberian Range is the presence of low-grade metamorphism in certain parts of the basin, an event that predates basin inversion. This paper describes the presence, textural relationships and geochemical aspects of authigenic and/or metamorphic monazite within different lithologies from the deepest parts of the basin. Sensitive high resolution ion microprobe (SHRIMP) U-Pb dating of monazite records the presence of two age populations: the first with 206Pb/238U ages ranging from 122 to 116 Ma which is considered as diagenetic in origin, whilst the second is dated at 99 +/- 2 Ma and postdates the metamorphic climax.

引用

页码：438 / 445

页数：8

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