About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Labile Quartz-poor Sediments from Young Mountain Ranges in Northeast Papua
Bryan P. Ruxton
ABSTRACT
The young mountain ranges of northeast Papua have sharp crests and very steep side slopes mantled by shallow weakly weathered soils. Rock debris from slope denudation and stream corrasion is rapidly transported by streams and is deposited as alluvial fans and plains and littoral deltas and beaches.
The sediments range from coarse conglomerate in some fans to clay in freshwater and some tidal swamps. The present study has concentrated on the fine sand fractions which have about 4 percent of quartz and 1 percent opaque minerals. Of the remainder one-half is rock fragments in various stages of weathering, one-quarter is unstable light minerals (mostly plagioclase), and one-quarter is unstable heavy minerals (mostly ferromagnesian minerals). These sediments have a dioritic and gabbroic chemical composition and are classed as plagioclass-rich litharenites. It is concluded that the terrestrial part of the sedimentary cycle is extremely rapid in the active orogenic portions of the humid tropics.
Only the beach sands have reached a mature stage (with under 0.5), but the grains are mostly angular.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 | |
Open PDF Document: $24 |