期刊
BOLETIN DE GEOLOGIA
卷 42, 期 3, 页码 205-226出版社
UNIV INDUSTRIAL SANTANDER
DOI: 10.18273/revbol.v42n3-2020009
关键词
Cienaga de Oro Formation; San Jacinto Fold Belt; Provenance; Heavy minerals; Paleocurrents; Northern South America plate
类别
A stratigraphic section in the San Jacinto fold and thrust belt located at northwestern Colombia was studied. This section displays part of the Oligocene-Early Miocene Cienaga de Oro Formation (COF). This work analyses the sediments provenance using a multi-tool approach which include: (I) conglomerate and sandstone counting clast with mesh, (II) heavy minerals assemblages, (III) paleocurrents and (IV) U/Pb detrital zircon ages. The sedimentary sequence was deposited in deltaic to transitional environment deposition, with reduction in the waves and tidal effect, and increase in the dominance of transitional river processes upward the section. Two main source areas have been identified from a dissected arc province: a main granitic to pegmatitic and a secondary basic igneous source rocks, located to the east and southwest of the current position. Detrital zircon U-Pb geochronology analysis display four age populations: (I) Devonian-Permian, (II) Permian-Triassic, (III) Jurassic and (IV) Cretaceous, with maximum deposition ages of 75.2 +/- 0.9 Ma in the lower part of the section, 68.9 +/- 0.6 Ma in the middle and 74.5 +/- 0.7 Ma for the upper part. It is proposed that COF was sediment-supplied by a south-to-north fluvial system, which drained exposed basement blocks and their late Cretaceous to Paleogene sedimentary cover during the Oligocene. This fluvial system carried sediments from late Cretaceous plutons like the Antioqueno Batholith and mafic/ultramafic rocks, which make up the basement of the Western and Central Cordilleras.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据