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Wang, Wang et al., Lithos: Early cretaceous lamprophyre ...

2020-6-22 · Wang, Wang et al., Lithos: Early cretaceous lamprophyre dyke swarms in Jiaodong Peninsula, eastern North China Craton 20-06-22 14:50 : :

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Shoshonitic lamprophyre dykes and their relation to ...

Calc-alkaline (shoshonitic) lamprophyre (CAL) dykes are also associated with mineralisation with dilational lode structures acting as conduits for dyke intrusion, which has occurred before and after major quartz-stibnite veining. Dykes include minette and vogesite compositions and were emplaced in the late Permian (247–255 Ma), at the same ...

Late caledonian lamprophyre dyke swarms of South …

Late caledonian lamprophyre dyke swarms of South-Eastern Scotland Late caledonian lamprophyre dyke swarms of South-Eastern Scotland Now on home page. ads; Enable full ADS view . Abstract Citations (17) References (32) Co-Reads Similar Papers Volume Content ...

Petrogenesis of Early Paleozoic lamprophyre in North ...

2020-9-8 · The lamprophyre in NQB was emplaced into the plagioclase-amphibole schist of Luohansi Formation at Danjia village, the south of Danfeng County, which is bounded by Shangdan Suture to the north and Devonian Liuling Group to the south, both with the fault contact (Zhang et al. 2001).The lamprophyre exposed as dike with 20 m in the length and 0.5–1 m in the width, with pronouncedly …

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Dalam industri agregat pembinaan, industri ACE menjadikan mesin penghancur rahang, penghancur benturan, penghancur kerucut dan mesin pembuatan pasir sebagai peralatan penghancur teras. Atas dasar ini, kami telah mengembangkan sejumlah model untuk membentuk set padanan tinggi, sederhana dan rendah, yang dapat memenuhi keperluan produksi pelanggan dari pelbagai ton dan berbagai …

Lamprophyre Dyke–Marble Contact: An Example from …

2020-9-20 · Minerals 2020, 10, 828 3 of 18 lamprophyre, andesite, and felsite) in the study area are reported to have formed mostly in the Jurassic times [44]. Lamprophyre dykes are considered as a tectonic marker of late orogenic transtension [45].

ランプロファイア | かがわらし かがわの ...

2018-6-11 · のちょこちょこっていたランプロファイアにってみようということでってみました。 で、このをて、そういえばランプロファイアはったことがあるけど、(かぶらごしのろしば)ってったことがないし、 …

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Geologic units containing Lamprophyre

Lamprophyre, tinguaite (phonolite with acicular acmite crystals), phonolite, bostonite (trachyte), and malignite (mafic nepheline syenite), undifferentiated - Light-medium- to medium-dark-gray, aphanitic to fine-grained, alkalic to calcic-alkalic dikes and sills. Unit intrudes rocks from the Middle Proterozoic to the High Point Member of the ...

ALEX STREKEISEN-Lamprophyres-

The term "lamprophyre", from "lampros" and "porphyros" (glistening porphyry), was introduced by von Gumbel in 1874 for a group of dark rocks that form minor intrusions, contain phenocrystal brown mica and hornblende, but lack feldspar phenocrysts. Following its introduction, the term was broadened to encompass a wide variety of hypabyssal rocks ...

Geochemistry and mineral composition of lamprophyre …

2019-4-9 · lamprophyre dikes (Jami et al. 2007; Stosch et al. 2011) (figure 2a and b). The volcano-sedimentary unit is overlain by gypsum, micaceous shale and fine-grainedsandstone,limestoneanddolomiterec-ognized as Rizu and Dezu series (Samani 1993, 1998). The Hour lamprophyre dikes are situated in the southern part of the Tabas block and hosted

Petrogenesis of a Mesoproterozoic shoshonitic …

Lamprophyre has a marked shoshonitic character. • Trace element and isotope geochemistry reveals a heterogeneous source. • Lamprophyre magma generated by 1–2% melting of enriched mantle and underwent olivine + clinopyroxene fractionation. • Lamprophyre sourced from a relatively enriched mantle when compared to co-spatial kimberlites.

SHRIMP U-Pb zircon dating for lamprophyre from …

SHRIMP U-Pb zircon dating for lamprophyre from Liaodong Peninsula: Constraints on the initial time of Mesozoic lithosphere thinning beneath eastern China It is undebated fact that the lithospheric mantle beneath eastern China was considerably thinned during the Mesozoic time.

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Original paper Late Variscan calc-alkaline lamprophyres …

2017-5-23 · Lamprophyre (shoshonite) magmas in the Fichtelgebirge–KHE anticlinorium were proposed as possible transport media for volatiles, U, Th, large ion lithophile elements (LILE), and rare and base metals (Kramer and Seifert 1994). In this paper we examine occurrences, mineral assemblages and bulk chemical composition of several lamprophyre types and

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Lamprophyre from Terina Complex, Chadobets alkaline ...

2021-7-29 · Nearest other occurrences of Lamprophyre 15.1km (9.4 miles) ⓘ Chuktukon carbonatite massif, Chadobets alkaline complex, Boguchansky District, Krasnoyarsk Krai, Russia and/or © mindat 19932021, ...

Lamprophyre Dikes

2020-10-20 · The lamprophyre is an igneous rock that traveled upward as molten rock into these cracks, cooled, then was subjected to intense amounts of heat and pressure. These intrusions of the lamprophyre into the cracked stone are called "dikes" and are estimated to have occured about 360 million years ago. Erosion, heat, and pressure are major ...

Minerals | Free Full-Text | Lamprophyre-Carbonatite …

The Bonga complex is composed of a central carbonatite plug (with a ferrocarbonatite core) surrounded by carbonatite cone sheets and igneous breccias of carbonatitic, fenitic, phoscoritic and lamprophyric xenoliths set in a carbonatitic, lamprophyric or mingled mesostase. To reconstruct the dynamics of the complex, the pyrochlore composition and distribution have been used as a proxy of ...

Geochronology and geochemistry of felsic xenoliths in ...

2018-9-30 · number of lamprophyre dikes with various types of crustal xenoliths are found in the Jingshan pluton (Figure 2a), which are the focus of the present study. The lamprophyre dikes intruded the granite in NE–SW directions, and are 0.5–2 m wide and 80–120 m long (Figure 2a and b). The lamprophyre samples are porphyritic with abundant phlo-

Lamprophyre dikes as tectonic markers of late orogenic ...

[1] Variscan Central Iberian Zone lamprophyre dikes cut synorogenic to late orogenic peraluminous S-type granitoids marking an important shift in regional tectonic regime from earlier, 350–290 Ma, extension-related crustal melting to later, 265 Ma, transtension-related mantle melting. The mean trend of the camptonite and bostonite dikes strikes ∼36° counterclockwise of the associated N-S ...

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Keywords NWVietnam;Cenozoic;Lamprophyre ;Geochemistry;SrNdPbisotopes ...

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40Ar/39Ar phlogopite geochronology of lamprophyre …

The spatial and temporal association of post-collisional granites and lamprophyre dykes is a common but enigmatic relationship in many orogenic belts, including the Variscan orogenic belt of SW England. The geology of SW England has long been interpreted …

Lamprophyre from Kosyu occurrence, Chetlasskiy Kamen ...

2021-7-29 · Click here to view Lamprophyre data Locality Data: Click here to view Kosyu occurrence, Chetlasskiy Kamen'', Timan Range, Komi Republic, Russia and/or © mindat 19932021,。

Paleomagnetism and Geochemistry of ~1144‐Ma …

The lamprophyre dikes are narrow (<1 m), fine- to medium-grained and show dark gray-green color on fresh surfaces and brownish color on weathered surfaces. They dip mainly vertically and their strikes fan from a locus in Lake Superior (Figure 1). Many dikes exhibit sharp contacts with the country rock and occasionally have chilled margins.

Lamprophyre: Mineral information, data and localities.

A group of dark-colored, porphyritic, hypabyssal igneous rocks characterized by panidiomorphic texture, a high percentage of mafic minerals (esp. biotite, hornblende, and pyroxene), which form the phenocrysts, and a fine-grained groundmass with the same mafic minerals in addition to feldspars and/or feldspathoids; also, any rock in that group.

Academics in Radioactive Lamprophyre

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Lamprophyre | Properties, Composition and Formation

2019-5-11 · Lamprophyre. Lamprophyre is ultrapotassic igneous rock that is occurring as dikes, lopoliths, loccoliths, stocks and small intrussion. It is alkaline silica-undersaturated mafic or ultramafic rocks with high magnesium oxide, >3% potassium oxide, high sodium oxide and high nickel and chromium. Four minerals dominate these rocks: orthoclase ...

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Phosphorus in lamprophyre and lamproid rocks | …

The P2O5-content of 300 samples of lamprophyre, lamproid and some acid dyke rocks from three areas of the Bohemian Massif has been determined colorimetrically. The values established range from 0.02% in microgranite to 2.38% in an alkaline minette. A negative correlation exists between P2O5 and SiO2, and Al2O3, respectively, a positive one between P2O5 and TiO2, CaO and F, respectively. In the ...

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Periodic Mixing of Magmas Recorded by Oscillatory …

INTRODUCTION. Lamprophyre is a field term for alkali-rich, porphyritic dykes with essentially primary amphibole and/or mica phenocrysts, and is typified by the absence of felsic phenocrysts and groundmass olivine ().Lamprophyres are actually a wide variety of hypabyssal rocks with diverse mineral assemblages (Rock, 1977, 1984, 1986, 1987, 1991). ...

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