scholarly journals Heavy mineral assemblages in tills and their use in distinguishing glacial lobes in the Great Lakes region

1979 ◽  
Vol 16 (12) ◽  
pp. 2219-2235 ◽  
Author(s):  
Q. H. J. Gwyn ◽  
A. Dreimanis
Keyword(s):  
Great Lakes ◽  
Mineral Content ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Great Lakes Region ◽  
Adirondack Mountains ◽  
Magnetic Minerals ◽  
Grenville Province ◽  
Provenance Areas ◽  
Mineral Assemblages

Two main source areas of heavy minerals in tills have been defined in the Great Lakes region: a source in the Superior and Southern Provinces and another in the Grenville Province. The Superior–Southern source is typified by low heavy mineral content and high epidote percentage in contrast to the Grenville source which has a high content of heavy minerals of which garnet, tremolite, and to a lesser extent sphene and orthopyroxene are characteristic. The Huron lobe tills have a mineral suite characteristic of the Superior–Southern source. Two subsources can be distinguished in the Superior–Southern area; however, they are too limited in extent to be characteristic of major glacial lobes. Two other subsources have been identified in the Grenville provenance area: a western Grenville subsource containing abundant garnet and having a low purple–red garnet ratio; and an eastern Grenville subsource distinguished by high garnet and tremolite content and a garnet ratio generally greater than one. The western and eastern Grenville subsources are the provenance areas for the tills of the Georgian Bay lobe and the Ontario–Erie lobe respectively. A possible third Grenville subsource in the Adirondack Mountains is distinguished from other Grenville sources by a lower heavy mineral content and more abundant orthopyroxene and magnetic minerals. This assemblage may be characteristic of the southern portion of the Ontario–Erie lobe.

Heavy minerals in stream sediments from Churchill Falls, Labrador—an aid in bedrock mapping

1980 ◽  
Vol 17 (2) ◽  
pp. 244-253
Author(s):  
John Edward Callahan
Keyword(s):  
Frequency Distribution ◽  
Mineral Content ◽  
Regional Metamorphism ◽  
Stream Sediments ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Sediment Samples ◽  
Fluvial Deposits ◽  
Geologic Map ◽  
High Concentrations

Stream sediments from a 13 000 km2 previously glaciated area in central Labrador near Churchill Falls were examined for their heavy mineral content. The minus 0.25 mm (60 mesh) nonmagnetic heavy mineral fraction from 846 stream sediment samples consists mainly of magnetite, ilmenite. garnet, hornblende, epidote and minor clinopyroxene, orthopyroxene. kyanite. sillimanite, biotite. apatite, and zircon. Changes in the frequency distribution of epidote, hornblende, garnet, and sillimanite in the stream sediments correspond well with those reported in previously mapped underlying bedrock lithologies. The occurrence of kyanite and sillimanite, high concentrations of garnet and opaques (mainly ilmenite), and lower concentrations of hornblende and epidote were used to determine grades of regional metamorphism, resulting in revision of the geologic map of this area. Heavy minerals in glacial drift or fluvial deposits may be useful as an aid in mapping in glaciated areas.

scholarly journals The Use of Heavy Minerals in the Investigation of Barrier-Lagoon Coasts Development in Dapeng Peninsula, China

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 347
Author(s):  
Jing Feng ◽  
Wei Wang
Keyword(s):  
Heavy Mineral ◽  
Heavy Minerals ◽  
The Holocene ◽  
Sea Floor ◽  
Holocene Transgression ◽  
Mineral Assemblages ◽  
Beach Sediments ◽  
Lagoon Sediments ◽  
Inland Rivers ◽  
Heavy Mineral Analysis

Typical barrier-lagoon systems are developed at Dongchong and Xichong on the southern coast of the Dapeng Peninsula of Guangdong, China. This paper studies the evolution of the barrier coasts of the peninsula, using the examples of the Dongchong and Xichong Bays. The Holocene stratigraphic records from borehole drilling on the coast of Dongchong and Xichong show that lagoon sediments are overlaid with beach deposits, indicating that the barriers migrated landward and climbed over the lagoon sediments when the shoreface retreated during the Holocene transgression, reaching the present positions after 7–8 ka BP. Heavy mineral analysis in this paper shows that: (1) the ancient beach sediments of the two bays have the same heavy mineral assemblages, which are different from those of modern beaches; (2) the present beaches of the two bays have different heavy mineral assemblages, even they are located less than 3000 m from each other on the same coast. This supports the hypothesis that the barriers originally came from the inner shelves during the Holocene transgression, but draws a new conclusion that the source of the beach sediments changed to inland rivers over the last thousand years because of a lack of sediment source from the sea floor.

The Correlation of pre-Cambrian Granites by means of Heavy Mineral Analyses

1935 ◽  
Vol 72 (8) ◽  
pp. 341-350
Author(s):  
J. T. Stark ◽  
F. F. Barnes
Keyword(s):  
Field Studies ◽  
Difficult Problem ◽  
Heavy Mineral ◽  
Igneous Rocks ◽  
Heavy Minerals ◽  
Thin Sections ◽  
Mineral Assemblages ◽  
Sawatch Range ◽  
Heavy Mineral Analysis ◽  
Experimental Stage

The correlation of isolated outcrops of igneous rocks where two or more similar intrusions are exposed is a difficult problem which is not always solved by thin sections or field studies. Such a problem was encountered in mapping the closely related Pikes Peak and Silver Plume granites of pre-Cambrian age in the Sawatch Range of central Colorado (Fig. 1). A comparison of the heavy minerals of the isolated outcrops with those of known granites was undertaken; and for this purpose large samples, suitable for crushing and heavy mineral analysis, were collected from various points within the areas of each batholith, and from the small outcrops whose age was in question. It was hoped that sufficient similarities in the heavy mineral assemblages might be established to be of value in making correlations. Furthermore, as work on the heavy minerals in igneous rocks is still in the experimental stage, a series of analyses from various parts of a given batholith should throw some light on the question of whether heavy minerals may be distinct and constant enough to be characteristic and so give a reliable means of correlation of isolated exposures.

On the Heavy Mineral Assemblages of the Great Chalky Boulder-clay and Cannon-shot Gravels of East Anglia, and their Significance

1932 ◽  
Vol 69 (7) ◽  
pp. 314-320 ◽  
Author(s):  
J. D. Solomon
Keyword(s):  
Mineral Content ◽  
Heavy Mineral ◽  
General Survey ◽  
Glacial Deposits ◽  
East Anglia ◽  
Mineral Assemblages ◽  
Boulder Clay

IN the course of a general survey of the Glacial deposits of East Anglia it has been found necessary to investigate the mineral content of a large number of samples of the well-known “Chalky Boulder-clay” over a considerable area of Norfolk and Suffolk.

Statistical Methods in Sedimentary Petrology. Part I. Percentage Composition of Assemblages and their Graphical Study

1939 ◽  
Vol 76 (7) ◽  
pp. 297-309 ◽  
Author(s):  
Frank Smithson
Keyword(s):  
Heavy Mineral ◽  
Heavy Minerals ◽  
Mathematical Methods ◽  
Percentage Composition ◽  
Sedimentary Petrology ◽  
Mineral Assemblages ◽  
Before And After ◽  
Probable Effect ◽  
Final Composition ◽  
Do So

In recent years much work has been done in determining the quantitative—or more strictly “numerical”—composition of heavy mineral residues from sedimentary rocks in the hope of obtaining evidence as to whence the detritus was derived. It is clear that the petrological characteristics of the land mass whose erosion provides the detritus must always be an important factor in predetermining the percentage composition of the residue as we now find it. Yet the sorting action of the transporting agents (which tend to separate the heavy from the less heavy minerals) and of chemical agents (which, both before and after deposition, destroy some minerals and introduce new ones) may often be suspected of having a great or even a dominating influence upon the final composition of the residue. It is proposed in this paper to investigate by simple mathematical methods the probable effect of these processes and to do so along lines which have been suggested by the study of actual heavy mineral assemblages.

scholarly journals Sedimentuntersuchungen an unterpleistozänen Schmelzwasserablagerungen und Periglazialschottern im Riß-Iller-Gebiet, deutsches Alpenvorland

2007 ◽  
Vol 56 (3) ◽  
pp. 186-211 ◽  
Author(s):  
Andreas Gerth ◽  
Raimo Becker-Haumann
Keyword(s):  
Size Fraction ◽  
Crystalline Rocks ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Systematic Change ◽  
Mineral Assemblages ◽  
Lower Pleistocene ◽  
Sand Size

Abstract. The Lower Pleistocene meltwater deposits at the contact of the Rhine- and Illergalcier (Baden-Württemberg, Bavaria) and the periglacial sediments occurring below them are described. The research is focused on the analysis of the petrography of the pebble-size fraction and of the sand-size heavy mineral assemblages of the Biber-, Donau- and Günz-age deposits. The results confirm that the periglacial sediments can be distinguished clearly from the glaciofluvial material by arguments of the petrography. However, a systematic change of the lithology also within the glaciofluvial material can be inferred from the high number of the investigated samples. Within the gravel fraction the amount of crystalline rocks, radiolarite and hornstone increases towards the younger accumulation units, whereas the content of calcareous components decreases. Concerning the heavy minerals the amount of instable minerals as Garnet and Hornblende decreases, while the portion of Staurolite increases remarkably towards the younger deposits. In the paper at hand these results are interpreted with respect to the paleogeography, in order to figure out the river development of the Riß-Iller-tract.

scholarly journals Provenance of Paleozoic very low- to low-grade metasedimentary rocks of South Tisia (Slavonian Mountains, Radlovac Complex, Croatia)

2013 ◽  
Vol 64 (1) ◽  
pp. 3-22 ◽  
Author(s):  
Vanja Biševac ◽  
Erwin Krenn ◽  
Fritz Finger ◽  
Borna Lužar-Oberiter ◽  
Dražen Balen
Keyword(s):  
Heavy Mineral ◽  
Age Dating ◽  
Heavy Minerals ◽  
Low Grade ◽  
High Concentration ◽  
Depositional History ◽  
Metasedimentary Rocks ◽  
Rock Types ◽  
Mineral Assemblages ◽  
Insight Into

Abstract Monazite age dating, detrital heavy mineral content and whole-rock geochemistry provided insight into the provenance, depositional history and paleogeological setting of the Radlovac Complex very low- to low-grade metasedimentary rocks (South Tisia, Slavonian Mountains, Croatia). Electron microprobe based Th-U-Pb dating of detrital monazite indicates a Variscan age of the protolith (330 ± 10 Ma). The detrital heavy mineral assemblages of representative metasedimentary rocks are dominated by apatite, zircon, tourmaline and rutile accompanied by minor quantity of epidote/zoisite, monazite and titanite. Judging from the heavy mineral assemblage, felsic igneous rocks served as the source material. This is consistent with the major and trace element spectrum of studied metasedimentary rocks characterized by high concentration of Th, high L + MREEs and high ratios of La/Sc, Th/Sc, La/Co, Th/Co and Th/Cr. The occurrence of magmatic monazite, zircon and xenotime and the absence of metamorphic heavy minerals suggest that granitoids, migmatites and migmatitic gneisses served as one major source for the metapsammites. Such rock types are commonly exposed in the Papuk Complex of the older surrounding complexes, while the Psunj Complex also contains metamorphic rocks. This is in good correlation with the monazite ages presented here which fits better with ages of Papuk Complex representative rocks than with those of the Psunj Complex known from the literature. Overall, data show that the Radlovac Complex represents the detritus of the local Variscan crust characterized by granitoid bodies, migmatites and migmatitic gneisses typical for the Papuk Complex.

Heavy Mineral Assemblages of Soils from the Gold-fields of Western Australia

1936 ◽  
Vol 73 (11) ◽  
pp. 503-511
Author(s):  
Dorothy Carroll
Keyword(s):  
Western Australia ◽  
Soil Samples ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Mineral Assemblages ◽  
Parental Material ◽  
The Relationship ◽  
Gold Bearing

A NUMBER of soil samples were collected from Kalgoorlie, Southern Cross, and other areas in the gold-bearing belt of Western Australia with a view to establishing the relationship between the “ heavy ” minerals of the soils and those of the parental material.

scholarly journals Tungsandsforekomster i Danmark

1960 ◽  
Vol 33 ◽  
pp. 1-63
Author(s):  
Werner Christensen ◽  
Gunnar Larsen
Keyword(s):  
Mineral Content ◽  
Field Studies ◽  
Economic Importance ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Large Deposits

Occurrences of heavy minerals along the coasts of Denmark have been investigated for the purpose of clarifying the question of to what extent these deposits contain minerals of economic importance in such quantities as to make extraction worth while.The plan included field studies of the nature and size of the occurrences as well as laboratory analyses of the mineral content in the sand.It has been ascertained that there are about 25 kilometres of beach in all with a high content of well-concentrated heavy mineral sand. The quantity of this sand is estimated at about 100,000 tons. Most of the large deposits were found to be in northern and western Jutland. It was ascertained that the following minerals assumed to be of economic importance were present: magnetite, ilmenite (containing haematite), and zircon. Other minerals, for example garnet, may prove useful as a by-product of extraction.

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