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

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2009-06-01Department
Ciencias de la TierraAbstract
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.
Subjects
SHRIMP dating; very low-grade metamorphismCollections
- Artículos Científicos [4803]
- Articulos Científicos CC. Tierra [114]