(PDF) Rock Classification Scheme Vols 1-4 (BGS) | Aditya ...

The BGS hierarchical rock classification scheme has up to 1996), which include new mineralogical and/or geochemical ten levels which can be used to classify virtually all geo- definitions and a revised sequence for the systematic classifica- 4 ftion of these rocks (Figure 2b), have been partly adopted here.

(PDF) The lamprophyre facies

5) define a facies as "a body or interval of rock or sediment which has a unique definable character that distinguishes it from other facies or intervals of rock or sediment".

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Kiln Operation Parameters

2021-1-19 · Cement kiln Wikipedia. 01/10/2006· The objective of kiln operation is to make clinker with the required chemical and physical properties, As a parameter in kiln control, free CaO data is somewhat ineffective because, even with fast automated sampling and analysis, the data, when it arrives, may be 10 minutes "out of date", and more immediate data must be used for minute …

Sources of metals in the Porgera gold deposit, Papua New ...

1991-2-1 · ROCK et al. (1989) and ROCK and FINLAYSON (1990) sug- gest that some of these lithologies are lamprophyres or appinites, and that the parental magma at Porgera was lamprophyric. However, in our collection of over 140 samples of intrusive rocks from Porgera, only 5 fit the textural and mineralogical criteria for definition as lamprophyres as set ...

The petrography and geochemistry of the Clericy Pluton: …

1991-7-1 · Rock types range from ultramafic to granite, however the majority is located in the syeno- diorite and syenite fields. The ultramafic and related rocks (Mclntosh, 1977 ) plot in the ul- tramafic, gabbro and monzo-gabbro fields of Fig. 2, whereas the syenitic and related rocks of the same author plot mainly in the syeno- gabbro, syeno-diorite ...

Petrogenesis of the basalts and rhyolite porphyries of the ...

The second metallogenic event is dated at 231-240 Ma. Syn-collisional and post-collisional magmatic activity associated with the closure of the Paleo-Tethys Ocean spread along the Ailaoshan fault ...

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(PDF) Age, Distribution, and Composition of Igneous Rocks ...

Carlin-type gold deposits at Long Canyon and West Pequop in the Pequop Mountains are two of Nevada's newest and most significant exploration discoveries. These discoveries have generated great interest, because they lie far east of the known gold

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(PDF) The influence of magmatic processes on the ...

rock, the size of the plut ons (there is a rough correlation between the cool i ng rate of the pluton, which decreases from the south west to the north e ast, and an increase i n pluton volume in this

A thermochemical model of Eurasian Permo-Triassic …

2010-9-1 · The analysis of a thermochemical plume model together with recent geological and geochronological data on magmatic ore systems in the Siberian, Tarim, Emeishan, Central European, and some other large igneous provinces (LIPs) enabled the following characteristics of the metallogeny in large igneous provinces to be revealed: (1)

Lamprophyre dikes as tectonic markers of late orogenic ...

2017-7-19 · country rock. Nevertheless, an indication of the structural control on emplacement was obtained for a bostonite dike. High above Prado de las Pozas (Figure 2) a 10 m wide K‐ feldspar porphyry dike cuts the Hoyos granodiorite; striking NW‐SEanddippingsteeply,64°totheNE.Thecontactwith the host rock is largely planar with a …

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Late stage aplite and porphyry dykes, as well as lampro-phyre dykes cut the granite phases of the complex. Syn-plutonic mafic dykes and mafic to ... that cut into the country rock and a few, ap-proximately 1 m wide lamprophyre dykes oc-curring within the complex. The contact with ... Eu), and by lower Ca, Mg, Al, P, B, and Sr when compared to ...

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Mineral composition of alkaline lamprophyres of the …

2017-8-1 · The influence of parental melts on the chemical composition of rock-forming minerals of alkaline lamprophyres (monchiquites) referred to as the volcan…

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The nature and origin of lamprophyres: some definitions ...

1977-9-1 · Griffin and Taylor (1975) considered damkjernite to be a "lampro- phyric", alnoitic rock. Both damkjernite and alnoite (Tilley and Yoder, 1967) have been regarded as products of direct partial melting of mantle peridotite or pyroxenite under CO2-rich vapour phase, illustrating how dif- ferent this subgroup is, petrogenetically, from the others.

Antimony vein deposits of China

1993-7-1 · The Chinese antimony vein-type ore deposits account for 55% of the world''s reserves of antimony. About 85% of China''s antimony production comes from Human Province, largely from the giant Xikuangshan deposit (the world''s largest Sb deposit). China''s Sb deposits occur in four belts. Most deposits are located in the Provinces of Jiangxi, Hunan ...