Detrital chromian spinels from the Minokuchi and Uzuhiki Formations in the Itsukaichi area of the Kanto Mountains, central Japan
The AA. describe the occurrence of detrital chromian spinels from the Upper Cretaceaous Uzuhiki Formation and Lower Jurassic? Minokuchi Formation, and discuss their significance briefly.
Petrology and paleoenvironmental significance of detrital sand and silt in a stalagmite from Drotsky's cave, Botswana
Analysis of a stalagmite from northwestern Botswana shows that variation in the abundance of detrital grains, which can be conveniently approximated by gray-scale measurements, provides a potentially valuable paleoclimatological record. Gray scale
(a measure of the lightness or darkness of the cut speleothem is inversely correlative with detrital content and thus with periods of decreased rainfall. It also correlates positively with historical records of rainfall and with rates of speleothem growth
Cosmogenic 21Ne analysis of individual detrital grains : opportunities and limitations
from frequency distributions of cosmogenic 21Ne concentrations in individual detrital grains. The model fully accounts for variations in nuclide production due to changes in latitude, altitude and topographic shielding and allows for spatially variable
erosion and sediment transport rates. Model results show that the form of the frequency distribution of 21Ne concentrations in exported sediment can be used to infer the range and spatial distribution of erosion rates that characterise the catchment.
Sediments from Rapid Lake document glacial and vegetation history in the Temple Lake valley of the Wind River Range, Wyoming over the past 11,000 to 12,000 yr. Radiocarbon age determinations on basal detrital organic matter from Rapid Lake
and Temple Lake bracket the age of the Temple Lake moraine, suggesting that the moraine formed in the late Pleistocene.
Soil and (soilarenite) and related cohesive detrital deposits : examples from a wet temperate climatic zone
This article is an attempt to summarize the actual state of knowledge concerning the cohesive detrital deposits and to elaborate a more comprehensive terminology and classification. Examples of cohesive detrital deposits described and illustrated
Soils on uplifted Quaternary reef terraces of barbados, 125,000 to 700,000 yr old, form a climo-chronosequence and show changes in physical, chemical, and mineralogical properties with terrace age. Parent materials are dust derived from the Sahara
, volcanic ash from the Lesser Antilles island arc, and detrital carbonate from the underlying reef limestone. Although some terrace soils are probably eroded, soils or their remnants are redder and more clay-rich with increasing terrace age. Comparisons
the detritic deposits of A. Efthemia and the oldest breccia on the southern talus of the Parnassus cannot be considered as one and the same thing: the former one is older than the latter. Both Mindelian and Wurmian talus fans are related to rhexistasic crisis
Mexico city is built on the sediments of the former Texcoco lake, which are characterised by the presence of a siliceous deposit, up to 70 m in thickness, called jaboncillo. The jaboncillo is composed dominantly of amorphous silica and iron oxides
and hydroxides, with minor amounts of phyllosilicates and detrital volcanic minerals. The mineralogy, the micromorphology and physical and chemical properties are discussed. The AA. aim to determine how far some of their properties change with loss of water due
Late Pleistocene detrital sediment yield of the Jura Glacier, France
In this study, glacial mechanical erosion is evaluated using a somewhat more reliable technique and the level of uncertainty is estimated. This paper quantifies the glacial material trapped in a proglacial lake where all the detrital material
Testing the reliability of detrital cave sediments as recorders of paleomagnetic secular variations, Seso Cave System (Central Pyrenees, Spain)
A paleomagnetic study has been carried out on a waterlaid detrital sedimentary sequence within the Seso Cave System (West-Central Pyrenees). The detrital sedimentary sequence is made of autochthonous (piping detached material from the Eocene marls
Anomalous radiocarbon ages from a Holocene detrital organic lens in Alaska and their implications for radiocarbon dating and paleoenvironmental reconstructions in the Artic
The work of CCOP/SOPAC over the past decade is described as is the growth of its functions. Survey findings relating to manganese, cobalt, a variety of sulphide and detrital minerals, phosphates, hydrocarbons, coral and gravel are presented.
Stratigraphic and petrographic study of foredeep molasse sediments, which provide a detrital record of the evolution of the southern Himalayas during the tectonic collision of central Asia and India.
of the mountains are the main ridge. The E-SE part is called Muntii Olăneştilor, it is made up mainly of detritic sedimentary rocks. The most interesting part is the massif called Buila-Vînturariţa. It is made of Jurassic limestone. Piatra Tîrnovului on the NE edge
This paper summarizes the dune sands layer of MGS1 stage in Milanggouwan section first, then compares it with the related chemical elements and detrital minerals of modern dune sands, and identifies the time of each layer of dune sands by the age
the quartz grain, hence silica lost through dissolution. Finally, some of the broader geomorphic implications of internal weathering are discussed, with a focus on the production of detrital quartz, the dissolution of silica, the evolution of weathering