Classification and nomenclature of plutonic rocks recommendations of the IUGS subcommission on the systematics of Igneous Rocks

Streckeisen, A.

doi:10.1007/bf01820841

Cited by 524 publications

(342 citation statements)

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“…In this report, "granitic" refers to leucocratic plutonic rocks containing more than 5 percent modal potassium feldspar and more than 20 percent modal quartz, thus avoiding the broader term "granitoid." Rock names in this report are those of the classification of plutonic rocks of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks (Streckeisen, 1973(Streckeisen, , 1976.…”

Section: Precambrian Plutonic Rocks Of the Arabian Shieldmentioning

confidence: 99%

“…The rock names given in the classification part of the table are those recommended by the International Union of Geological Sciences (lUGS) Subcommission on the Systematics of Igneous Rocks (Streckeisen, 1973(Streckeisen, , 1976(Streckeisen, , 1979. Each rock name is a consensus or a best compromise of the available petrography and of the normative mineralogy, but for consistency the naming strongly emphasizes the classification schemes of the lUGS subcommission and of Irvine and Baragar (1971).…”

Section: Introductionmentioning

confidence: 99%

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Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Brown¹,

Schmidt²,

Huffman³

1989

Professional Paper

107

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Section: Precambrian Plutonic Rocks Of the Arabian Shieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Brown¹,

Schmidt²,

Huffman³

1989

Professional Paper

107

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“…Plumes are now thought to constitute eclogite-peridotite mixtures, and the eclogite component required in plumes is hypothesized to represent recycled oceanic crust subducted as far down as the base of the mantle (Cordery et al, 1997), to satisfy the perceived deep (plume) origins for CFBs. Pyroxenites have been defined as ultramafic rocks made up of pyroxenes without or with olivine, the modal olivine content not exceeding 40% (Streckeisen, 1973). Pyroxenites in the sub-lithospheric mantle may also represent subducted oceanic crust (e.g., Allègre and Turcotte, 1986), and have a large range of major element compositions between peridotites and basalts (Hirschmann and Stolper, 1996).…”

Section: Introduction: Flood Basalt Genesis In the Mantle Plume Modelmentioning

confidence: 99%

Were the Deccan Flood Basalts Derived in Part from Ancient Oceanic Crust Within the Indian Continental Lithosphere?

Sheth¹

2005

Gondwana Research

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Deep mantle plumes supposedly incorporate deeply subducted eclogitized oceanic crust, and continental flood basalts (CFBs) are now thought by some to be derived from such eclogite-bearing peridotite plumes. Eclogite-peridotite mixtures have much lower solidi (and produce much greater melt fractions for a given temperature) than peridotite. Ferich (eclogite-or pyroxenite-bearing) sources have been inferred for many CFBs. However, plumes with considerable amounts of eclogite should have difficulty in upwelling owing to the high density of eclogite. Besides, CFBs are always located along pre-existing lithospheric structures (suture zones, edges of thick cratons) and commonly associated with lithospheric rifting and continental breakup. India's major late Mesozoic CFB, the Deccan Traps, erupted through rift zones and a new continental margin that had developed along ancient suture zones traversing the subcontinent. Many Deccan basalts are too Fe-rich to have been in equilibrium with a peridotite mantle source, and have commonly been considered to be significantly fractionated derivatives of picritic liquids. However, it is possible to view them as relatively less evolved liquids derived from a source with extra fertility (i.e., an Fe-rich source). A new non-plume, plate tectonic model for Icelandic hotspot volcanism involves melting of a shallowly recycled slab of eclogitized Iapetus oceanic crust formerly trapped along the Caledonian suture. The model explains the geochemical-petrological characteristics of Icelandic basalts, and is consistent with passive upper mantle upwelling under Iceland inferred from recent seismic tomography. Based on the petrological and geochemical features of the Deccan flood basalts of the type section, in the Western Ghats, I propose that old, eclogitized oceanic crust trapped in the ancient Indian suture zones could have produced voluminous basaltic melts during the Deccan event.

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“…The reader is referred to the original maps and the sources that they reference for more detail. Granitic rocks in this report are classified according to Streckeisen and others (1973).…”

Section: Methods Of Studymentioning

confidence: 99%

Mineral resource potential and geology of the White River National Forest and the Dillon Ranger District of the Arapaho National Forest, Colorado, with a section on salable commodities

Toth¹,

Wilson²,

Cookro³

et al. 1993

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This summary highlights the mineral resources of the Forest and is presented to aid land-use planners and other non-scientific personnel.This study was undertaken at the request of the U.S. Forest Service. The USGS assessment involved a team of six scientists with expertise in geology, geochemistry, geophysics, mineral deposits, and resource analysis. The Forest includes part of the Colorado Mineral Belt, one of the most productive areas of base and precious metals in North America.Mining and mineral exploration have played a central role in the history of the Forest since the early 1800's; several world-class mines are either in or adjacent to the Forest, and smaller mines are abundant throughout the Forest.More than $15 billion in metals (at current-day prices) has been produced in mining areas adjacent to or within the Forest.The last producing mine (Oilman mine) ceased its operations in 1981; current mineral-related activity consists of annual assessment work on unpatented mining claims, prospecting, and small-scale mining. Large tracts within the Forest, including Wilderness Areas, have abundant direct and indirect indications of the presence of metallic mineral deposits.Fourteen metallic mineral-deposit types were identified in the Forest; of these, stockwork molybdenum, polymetallic vein, polymetallic replacement, and placer gold deposits are the most likely to have undiscovered resources.The commodities most likely to occur are molybdenum, zinc, lead, silver, gold, and copper.Estimates of the number of undiscovered deposits were made at three probability levels (90,50, and 10 percent); estimated tonnages were determined by statistical iteration with tonnages and grades of known deposits worldwide.Favorable tracts are shown in figure 1 of this report. Probabilistic estimates, which do not take into account the cost of recovery, indicate a mean value of $4.05 billion for undiscovered metallic mineral resources in the Forest (shown below).

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Classification and nomenclature of plutonic rocks recommendations of the IUGS subcommission on the systematics of Igneous Rocks

Cited by 524 publications

References 1 publication

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Were the Deccan Flood Basalts Derived in Part from Ancient Oceanic Crust Within the Indian Continental Lithosphere?

Mineral resource potential and geology of the White River National Forest and the Dillon Ranger District of the Arapaho National Forest, Colorado, with a section on salable commodities

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