scholarly journals U-Pb zircon and hf compositon of granitoid Chieng Khuong complex

2014 ◽  
Vol 17 (2) ◽  
pp. 67-81
Author(s):  
Nhu Thanh Ha ◽  
Hieu Trung Pham
Keyword(s):  
Partial Melting ◽  
Isotopic Ratio ◽  
Hf Isotope ◽  
Primary Magma ◽  
Late Paleozoic ◽  
Mantle Material ◽  
Weighted Mean ◽  
Forming Process ◽  
Icp Ms ◽  
Magma Crystallization

Zircon crystals selected from granitoid Chieng Khuong Complex V0938 sample and V0821 have the LA-ICP-MS U-Pb analyses clustered at 263±8 Ma. Two sample zircon analyses give concordant ages concentrated at 263± 8 Ma (weighted mean). These results indicate the protolith of the granitoid Chieng Khuong Complex (primary magma crystallization age) to be late Paleozoic (ca. 263 Ma). The results Hf(t) of Chieng Khuong granitoid show that Hf isotopic ratio from -6.4 to-13.3, indicated granitoid was formed in a complicated environment and origin through partial melting of Proterozoic crust. Combine with Hf isotope and petrological probably indicating existence of the mixture between crust and mantle material during the formation of the magma. Thus, these rusults indicate the mixing crust – mantle model which is the main way to forming process of Chieng Khuong complex.

scholarly journals The LA-ICP-MS U-Pb zircon age of rhyolite from the Dong Trau formation and its geological significances

2018 ◽  
Vol 1 (T5) ◽  
pp. 270-277
Author(s):  
Hieu Trung Pham
Keyword(s):  
Primary Magma ◽  
Early Triassic ◽  
Late Permian ◽  
Weighted Mean ◽  
Zircon Age ◽  
Analytical Results ◽  
Icp Ms ◽  
Magma Crystallization ◽  
Sr Method

Zircons separated from an rhyolite sample in the Dong Trau formation, in the southern of Hà Tĩnh province were dated to determine the protolith age for the complex. Sixteen LA-ICP-MS U-Pb zircon analyses give concordant ages concentrated at 256 Ma (weighted mean). These results indicate the protolith age of the rhyolite (primary magma crystallization age). The value of this age are close to the analytical results pf the whole rock by Rb-Sr method and biotite Rb-Sr method. Therefore the crystallization age of the rhyolite from the Đồng Trầu formation corresponded period late Permian to early Triassic.

scholarly journals 278 Ma U-Pb zircon age of metagranite in Bo Xinh complex area of song Ma structural zone and its significances

2014 ◽  
Vol 17 (4) ◽  
pp. 42-48
Author(s):  
Hieu Trung Pham
Keyword(s):  
Primary Magma ◽  
Early Permian ◽  
Weighted Mean ◽  
Zircon Age ◽  
Mafic Rocks ◽  
Icp Ms ◽  
Magma Crystallization

Zircons separated from an meta-granite dyke sample in the Bo Xinh complex area were dated to determine the protolith age for the complex. Nine LA-ICP-MS U-Pb zircon analyses give concordant ages concentrated at 278 Ma (weighted mean). These results indicated the protolith age of the metagranite dyke (primary magma crystallization age). These meta-granite dyke penetrated the mafic rocks of Bo Xinh complex, therefore it can be confirmed that the crystallization age of the mafic rocks of Bo Xinh complex must be older than 278 Ma (early Permian).

scholarly journals The U-Pb zircon age of granodiorite from Dinh Quan Deo Ca complex of Truong Xuan Khanh Hoa area and its geological significance

2015 ◽  
Vol 18 (4) ◽  
pp. 5-11 ◽  
Author(s):  
Hieu Trung Pham
Keyword(s):  
Primary Magma ◽  
Weighted Mean ◽  
Zircon Age ◽  
Geological Significance ◽  
Icp Ms ◽  
Magma Crystallization ◽  
Sr Method

Zircons separated from an granodiorite sample at the Dinh Quan - Deo Ca complex area were dated to determine the protolith age for the complex. Sixteen LA-ICP-MS U-Pb zircon analyses gave concordant ages concentrated at 96 Ma (weighted mean). These results indicated the protolith age of the granodiorite (primary magma crystallization age). The value of this age is close to results analyzed by Rb-Sr method and Ar-Ar method, confirming the crystallization age of the granodiorite Dinh Quan Deo Ca complex corresponding period early Cretaceou.

scholarly journals The emplacement age of the Muntele Mare Variscan granite (Apuseni Mountains, Romania)

2009 ◽  
Vol 60 (6) ◽  
pp. 495-504 ◽  
Author(s):  
Ioan Balintoni ◽  
Constantin Balica ◽  
Monica Cliveţi ◽  
Li-Qiu Li ◽  
Horst Hann ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Variscan Orogeny ◽  
Weighted Mean ◽  
Apuseni Mountains ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
History Of ◽  
The Alps ◽  
Last Stage

The emplacement age of the Muntele Mare Variscan granite (Apuseni Mountains, Romania)Like the Alps and Western Carpathians, the Apuseni Mountains represent a fragment of the Variscan orogen involved in the Alpine crustal shortenings. Thus the more extensive Alpine tectonic unit in the Apuseni Mountains, the Bihor Autochthonous Unit is overlain by several nappe systems. During the Variscan orogeny, the Bihor Unit was a part of the Someş terrane involved as the upper plate in subduction, continental collision and finally in the orogen collapse and exhumation. The Variscan thermotectonic events were marked in the future Bihor Unit by the large Muntele Mare granitoid intrusion, an S-type anatectic body. Zircon U-Pb laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) dating yielded a weighted mean age of 290.9 ± 3.0 Ma and a concordia age of 291.1 ± 1.1 Ma. U-Pb isotope dilution zircon analyses yielded a lower intercept crystallization age of 296.6 + 5.7/-6.2 Ma. These two ages coincide in the error limits. Thus, the Muntele Mare granitoid pluton is a sign of the last stage in the Variscan history of the Apuseni Mountains. Many zircon grains show inheritance and/or Pb loss, typical for anatectic granitoid, overprinted by later thermotectonic events.

Petrogenesis of Silicic Rocks from the Phan Si Pan - Tu Le region of the Emeishan Large Igneous Province, Northwestern Vietnam

2021 ◽  
pp. SP518-2020-253
Author(s):  
Thuy Thanh Pham ◽  
J. Gregory Shellnutt ◽  
Tuan-Anh Tran ◽  
Steven W. Denyszyn ◽  
Yoshiyuki Iizuka
Keyword(s):  
Basaltic Magma ◽  
Red River ◽  
Granitic Rocks ◽  
Large Igneous Province ◽  
Weighted Mean ◽  
Emeishan Large Igneous Province ◽  
Icp Ms ◽  
Igneous Province ◽  
Single Grain ◽  
Host Rocks

AbstractThe Permian silicic rocks in the Phan Si Pan (PSP) uplift area and Tu Le (TL) basin of NW Vietnam (collectively the PSP-TL region) are associated with the Emeishan Large Igneous Province (ELIP). The Permian Muong Hum, Phu Sa Phin, and Nam Xe - Tam Duong granites, and Tu Le rhyolites are alkali ferroan A1-type granitic rocks, which likely formed by fractional crystallization of high-Ti basaltic magma that was contaminated by melts derived from the Neoproterozoic host rocks. Zircon U-Pb LA-ICP-MS geochronology yielded weighted-mean 206Pb/238U ages of 246 ± 3 Ma to 259 ± 3 Ma for granites, and 249 ± 3 Ma and 254 ± 2 Ma for rhyolites. This is contrasted with previously-published high precision U-Pb ages, obtained using CA-ID-TIMS method applied on the same zircon grains, which suggest that the calculated LA-ICP-MS U-Pb ages are variably inaccurate by up to 10 Ma, though at the single-grain level dates generally agree within uncertainty. The similarity of rock texture, whole-rock geochemistry, emplacement ages, and fractionation phases between the PSP-TL region and silicic rocks in the Inner Zone ELIP (i.e., Panzhihua, Binchuan) suggests they were spatially proximal before being sinistrally displaced along the Ailao Shan-Red River shear zone.

scholarly journals Supplemental Material: Detrital zircons from Late Paleozoic Ice Age sequences in Victoria Land (Antarctica): New constraints on the glaciation of southern Gondwana

2021 ◽  
Author(s):  
Luca Zurli ◽  
Gianluca Cornamusini
Keyword(s):  
Inductively Coupled Plasma ◽  
Detrital Zircons ◽  
Ice Age ◽  
Late Paleozoic ◽  
Inductively Coupled ◽  
Victoria Land ◽  
Icp Ms ◽  
Late Paleozoic Ice Age ◽  
Plasma Mass Spectrometry ◽  
Shape Characterization

Raw laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) analysis and detrital zircon grain shape characterization of the late Paleozoic diamictite samples from Victoria Land, Antarctica.

High-resolution LA-ICP-MS trace-element mapping of magmatic biotite: A new approach for studying syn- to post-magmatic evolution

2020 ◽  
Vol 58 (3) ◽  
pp. 293-311 ◽  
Author(s):  
Zeinab Azadbakht ◽  
David R. Lentz
Keyword(s):  
New Brunswick ◽  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Fluid Phase ◽  
New Approach ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Magma Crystallization ◽  
Topaz Granite

ABSTRACT Biotite grains from 22 felsic intrusions in New Brunswick were mapped in situ using a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS). We investigated the extent to which biotite can retain its magmatic zoning patterns and, where zoning does exist, how it can be used to elucidate early to late stage, syn-magmatic to post-crystallization processes. Although the major element and halogen contents of the examined biotite phenocrysts are homogeneous, two-thirds of the grains display trace-element zoning for Ba, Rb, and Cs. The results also indicated that zoning is better retained in larger grains (i.e., > 500 × 500 μm) with minimal alteration and mineral inclusions. An exceptionally well-zoned Li-rich siderophyllite from the Pleasant Ridge topaz granite in southwestern New Brunswick shows Ti, Ta, Sn, W, Cs, Rb, and V (without Li or Ba) zoning. Cesium values increase from 200 to 1400 ppm from core to rim. Conversely, Sn and W values decrease toward the rim (50 to 10 and 100 to 10 ppm, respectively). Tantalum and Ti values show fewer variations but drop abruptly close to the rim of the grain (100 to 20 and 2000 to 500 ppm, respectively). These observations may indicate crystallization of mineral phases with high partition coefficients for these highly incompatible elements (except Ti) (e.g., cassiterite and rutile) followed by fractionation of a fluid phase at a later stage of magma crystallization. The preservation of zoning may indicate rapid cooling post-crystallization of the parent magma.

scholarly journals Differentiation Among Romanian Wine Regions Based on Lead Isotope Signatures

2019 ◽  
Vol 76 (2) ◽  
pp. 179
Author(s):  
Florin Dumitru BORA ◽  
Anamaria CĂLUGĂR ◽  
Claudiu Ioan BUNEA ◽  
Ionut RACZ
Keyword(s):  
Atmospheric Pollution ◽  
Lead Isotope ◽  
Isotopic Ratio ◽  
Isotope Ratios ◽  
Red Wines ◽  
Average Value ◽  
Icp Ms ◽  
Pb Concentration

The objective of this study is to determine the Pb concentration and 206Pb/204Pb, 206Pb/207Pb, 206Pb/208Pb from several Romanian winemaking regions, in order to highlight credible geographical markers of wine origin. The Pb level concentration and the ratios of 206Pb/204Pb, 206Pb/207Pb, 206Pb/208Pb were determined in 25 white and 9 red wines using ICP-MS techniques. Based on 206Pb/207Pb isotope ratios it can be concluded that the vines grown in the Tîrnave vineyard [Blaj (1.1790 average value)], Huși vineyard [Huși (1.1958 average value wine center), Averești (1.1908 average value)] and Iași vineyard [Copou (1.1875 average value) wine center], show traces of atmospheric pollution with lead [if 206Pb/207Pb=~1.1700-1.2200 (atmospheric pollution)]. Combining the 206Pb/204Pb with 206Pb/208Pb isotopic ratio may carry out a separation on the vineyards and wine-growing centers. Based on 206Pb/204Pb, 206Pb/207Pb and 208Pb/206Pb a separation of the wine samples was possible.

Concurrent Pb–Hf isotope analysis of zircon by laser ablation multi-collector ICP-MS, with implications for the crustal evolution of Greenland and the Himalayas

2009 ◽  
Vol 261 (3-4) ◽  
pp. 244-260 ◽  
Author(s):  
A.I.S. Kemp ◽  
G.L. Foster ◽  
A. Scherstén ◽  
M.J. Whitehouse ◽  
J. Darling ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Isotope Analysis ◽  
Hf Isotope ◽  
Crustal Evolution ◽  
Icp Ms
Sign in / Sign up

Export Citation Format

Share Document