(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A ...

Dynamic provenance variations are deduced from sand-grain detrital modes in samples obtained from the CRP-2/2A drillcore. Below an important unconformity at 307 metres below sea floor (mbsf), sand grains in most of the sequence were dominantly derived from Beacon sandstone and Ferra dolerite sources...

Full description

Bibliographic Details
Main Author: Smellie, John L
Format: Dataset
Language:English
Published: PANGAEA 2000
Subjects:
Online Access:https://dx.doi.org/10.1594/pangaea.191104
https://doi.pangaea.de/10.1594/PANGAEA.191104
Description
Summary:Dynamic provenance variations are deduced from sand-grain detrital modes in samples obtained from the CRP-2/2A drillcore. Below an important unconformity at 307 metres below sea floor (mbsf), sand grains in most of the sequence were dominantly derived from Beacon sandstone and Ferra dolerite sources, although alternating with subordinate thicknesses of strata derived from a predominantly granitoid source (Granite Harbour Intrusive Complex; GHIC). Above the 307 mbsf unconformities, the reverse situation occurs, with most sediments dominantly sourced in the GHIC. Contributions from other sources (e.g. Jurassic Kirkpatrick basalt lavas and Proterozoic metamorphic basement) are also persistent but minor. An input of fresh volcanic detritus commenced at 307 mbsf and is ubiquitous in all the younger sediments. At least three (probably four) episodes of volcanism are identified, each lasting 1-2 M.yr in duration. The initial influx at 307 mbsf corresponds to the initiation of the McMurdo Volcanic Group (MVG) at c. ... : Supplement to: Smellie, John L (2000): Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 545-552 ...