👁 Image
| | Report (article/chapter) | | geological studies of JARE in the
Napier Complex, Enderby Land, East Antarctica
Hideo Ishizuka
Geological Society...geological studies of JARE in the Napier Complex,
Enderby Land, East Antarctica
HIDEO ISHIZUKA
Department of...geochemistry and geochronology of the Napier Complex in Enderby Land,
East Antarctica. Detailed field investigations...Riiser-Larsen area and Tonagh Island, revealed that the Napier Complex comprises
layered and massive gneiss units...ultrahigh-temperature (UHT) metamorphism). P– T evolution of the Napier UHT metamorphism was examined by analyses of reaction | 👁 Image
| | Journal (article/letter/editorial) | | complementary traceelement thermometers, Ti-in-zircon and Zr-in-rutile
(Watson et al. 2006)—are straightforward...rhyolite glass (Lake county obsidian). Finely powdered
zircon or ZrO2 was added to most of the experiments,
Table...of providing data for the Zr-in-rutile
and Ti-in-zircon thermometers (Watson et al. 2006).
Although some...500 cps/
nA on peak, for each spectrometer), to avoid the
pulse-height analyzer (PHA) peak shifts that accompany...limits on the order of 20 ppm (for
300 s analyses on peak and on background, at 150 nA
current). Recently | 👁 Image
| | Report (issue) | | Al 1:40 )§= 12:00O 30 : (2) Mt.
Riiser-Larsen, Antarctica; by electron microprobe, corresponds to (K 0:97...sanidine, \hypersthene," tridymite, quartz, biotite,
zircon, magnetite, hematite, graphite.
Distribution: Following...Caucasus Mountains, Russia. From Reference Peak, Mt.
Riiser-Larsen, and nearby, in Enderby Land, Antarctica...Antarctica. In the Nain complex, at Ikkinikulluit
Brook, Labrador, Newfoundland, Canada.
Name:
For the relation...in the contact aureole of the anorthositic Nain complex, Labrador.
Amer. Mineral., 61, 29{37. (4) Armbruster | 👁 Image
| Audibert, N., Bertrand, P., Hensen, B. J., Kienast, J.-R., Ouzegane, Kh. (1993) Cordierite-K-feldspar-quartz-orthopyroxene symplectite from southern Algeria: new evidence for osumilite in high-grade metamorphic rocks. Mineralogical Magazine, 57 (387) 354-357 doi:10.1180/minmag.1993.057.387.20 | Journal (article/letter/editorial) | | respectively.
Osumilite breakdown products
The In Ouzzal complex is a Precambrian inlier
(450 km long) within a...Panafrican belt (Bertrand and Lasserre, 1976). This
complex, which was metamorphosed around 2 Ga
ago under...sillimanite (Sil),
and minor F-Ti-rich phlogopite, zircon and rutile.
In addition to these phases, very fine...been described in
granulite facies rocks from Antarctica where they
demonstrably formed by the breakdown...only been reported in a
granulite from Reference Peak, Antarctica
(Grew, 1982a). The In Ouzzal quartzite | 👁 Image
| | Journal (article/letter/editorial) | | associationfrom Archeanrocks in EnderbyLand, Antarctica
EDwARD S. Gnpw
Department of Earth and Space...Archean Napier complexin the Tula Mountains and Amundsen Bay
areasof Enderby Land, Antarctica (50'30'...(50'30' to 53'E; 67"5). Quartzitesfrom the Tula Mountains consistof SiOr, AlrOr, MgO, and FeO and contain virtually...virtually no alkalis or CaO. At the
peak of metamorphism, the mineral assemblagein these quartzites is...reaction between sapphirine
and quartz after the peak of metamorphism.Sapphirinesare somewhatmore siliceousthan | 👁 Image
| Baba, Sotaro, Dunkley, Daniel J., Hokada, Tomokazu, Horie, Kenji, Suzuki, Kazuhiro, Shiraishi, Kazuyuki (2012) New SHRIMP U–Pb zircon ages and CHIME monazite ages from South Harris granulites, Lewisian Complex, NW Scotland: Implications for two stages of zircon formation during Palaeoproterozoic UHT metamorphism. Precambrian Research, 200. 104-128 doi:10.1016/j.precamres.2012.01.013 | Journal (article/letter/editorial) | | SHRIMP U–Pb zircon ages and CHIME monazite ages from South Harris
granulites, Lewisian Complex, NW Scotland:...Scotland: Implications for two stages
of zircon formation during Palaeoproterozoic UHT metamorphism
Sotaro...SHRIMP U–Pb age dating
CHIME monazite ages
Lewisian Complex
South Harris
UHT metamorphism
a b s t r a c t...Sensitive high-resolution ion microprobe (SHRIMP) U–Pb zircon age dating was applied to several types
of granulites...granulites and gneisses from the Lewisian Complex in South Harris, NW Scotland, to clarify the timing
of | 👁 Image
| Srivastava, Rajesh K., Guarino, Vincenza, Wu, Fu-Yuan, Melluso, Leone, Sinha, Anup K. (2019) Evidence of sub-continental lithospheric mantle sources and open-system crystallization processes from in-situ U–Pb ages and Nd–Sr–Hf isotope geochemistry of the Cretaceous ultramafic-alkaline-(carbonatite) intrusions from the Shillong Plateau, north-eastern India. Lithos, 330. 108-119 doi:10.1016/j.lithos.2019.02.009 | Journal (article/letter/editorial) | | Fu-Yuan Wu, Leone
Melluso, Anup K. Sinha
PII:
DOI:
Reference:
S0024-4937(19)30073-8
https://doi.org/10.1016/j...different from the U-Pb age of 106.8±0.8 Ma on zircon of
Jasra syenites. The variation in Sr-Nd-Hf isotopic...in-situ U–Pb ages on zircon and perovskite, and Sr–Nd–Hf isotope data
ED
on zircon, perovskite, baddeleyite...2010, 2012).
Apatite, perovskite, baddeleyite, zircon, titanite, and calcite crystals from sixteen samples...Perovskite from SV10, SV31, SV33,
JS15P (Fig. 3) and zircon from SV52A and JS5S (Fig. 4) were selected for | 👁 Image
| | Journal (article/letter/editorial) | | Shuan-Hong Zhang Yue Zhao Hao Ye Guo-Hui Hu
PII:
DOI:
Reference:
S0301-9268(15)00364-2
http://dx.doi.org/doi:10...Paleomagnetism and Tectonic Reconstruction, Ministry of Land
Ac
ce
p
te
d
and Resources, Beijing 100081,... eastern North China
4
Craton (NCC). Our new zircon LA-ICP-MS U-Pb and baddeleyite SIMS Pb-Pb dating...oldest
38
cratons in the world and experienced a complex geological evolution since the early
39
Precambrian...Among them four
132
samples yield sufficient zircon grains and three samples yield sufficient baddeleyite | 👁 Image
| Wu, Fu-Yuan, Yang, Yue-Heng, Mitchell, Roger H., Bellatreccia, Fabio, Li, Qiu-Li, Zhao, Zi-Fu (2010) In situ U–Pb and Nd–Hf–(Sr) isotopic investigations of zirconolite and calzirtite. Chemical Geology, 277 (1) 178-195 doi:10.1016/j.chemgeo.2010.08.007 | Journal (article/letter/editorial) | | of
igneous and metamorphic rock types. Of these, zircon (ZrSiO4) and
baddeleyite (ZrO2), are very important...have been conducted, it is generally
accepted that zircon and baddeleyite are not suitable for Sr and Nd...rocks and syenites (Williams and Gieré, 1996, and
reference therein). Although it is known that zirconolite...internal standard and NIST610 as an
external reference material (Jackson et al., 2004; Griffin et al....an matrix reference peak of
40
+
Ca48Ti16
2 O4 at a mass resolution of ~ 8000 (at 50% peak height, fixed | 👁 Image
| | Journal (article/letter/editorial) | | zone dated at 593 ± 20, 548 ± 39 and 524 ± 12 Ma (zircon
U–Pb SHRIMP) separates the Tanzania Craton from...that is typical for island-arc basalts.
The U–Pb zircon ages at 593 ± 20 and 524 ± 12 Ma from the kyanite-free...continental block when Indo-Antarctica and, later,
Antarctica-Australia (East Gondwana) amalgamated (Boger...accuracy were ensured by using international reference standards, measuring blanks and some sample in...methods at the University of Kiel. U–Pb dating of zircon was done on a SHRIMP-II at the Center of Isotopic | 👁 Image
| | Journal (article/letter/editorial) | | solidii
to form large plutons. Nature is undoubtably complex, and can
produce exceptions to this model, but...Sources of shelf water and nutrient
fluxes in the East China Sea
estimated using rare earth elements
L...Blooms of the jellyfish Stomolophus nomurai in the East
China Sea (ECS) have occurred in the past approximately...acid- organic compound complex
under neutral condition: Silicic acid –
Tiron complex
1
2
1
SHUQIN BAI...dissolution due to formation of silicic
acid-tiron complex. The solubility of amorphous silica
increased with | 👁 Image
| Ling, Xiao-Xiao, Huyskens, Magdalena H., Li, Qiu-Li, Yin, Qin-Zhu, Werner, Ronald, Liu, Yu, Tang, Guo-Qiang, Yang, Ya-Nan, Li, Xian-Hua (2017) Monazite RW-1: a homogenous natural reference material for SIMS U–Pb and Th–Pb isotopic analysis. Mineralogy and Petrology, 111 (2) 163-172 doi:10.1007/s00710-016-0478-7 | Journal (article/letter/editorial) | | ORIGINAL PAPER
Monazite RW-1: a homogenous natural reference material
for SIMS U–Pb and Th–Pb isotopic analysis...from a Norwegian pegmatite as an excellent
hi-Th reference material for secondary ion mass spectrometric...SD) make this crystal also a good compositional reference material. We used the combined ID–TIMS(Pb)/ID–MC–...that the most commonly distributed U–Pb
monazite reference materials have rather low ThO2, we suggest
that...monazite with its ThO2 of 13.5 wt% is a suitable
reference material providing investigators more confidence | 👁 Image
| Wu, Fu-Yuan, Mitchell, Roger H., Li, Qiu-Li, Sun, Jing, Liu, Chuan-Zhou, Yang, Yue-Heng (2013) In situ UPb age determination and SrNd isotopic analysis of perovskite from the Premier (Cullinan) kimberlite, South Africa. Chemical Geology, 353. 83-95 doi:10.1016/j.chemgeo.2012.06.002 | Journal (article/letter/editorial) | | (Allsopp et al., 1989), with only a few determined by zircon
and perovskite U\Pb techniques (Davis et al., 1976;...the Transvaal Supergroup, the
Bushveld Igneous complex and the Waterberg Group, and was later cut
by an...the world's largest
(+400 carats) diamonds, is a complex body with numerous distinct
phases of diamondiferous...internal standard
and NIST610 as an external reference material (Jackson et al., 2004;
Griffin et al....40Ca 48Ti216O4
reference peak at mass 200. This peak of 40Ca 48Ti216O4 is a matrix reference for centering | 👁 Image
| Hoshino, Mihoko, Kimata, Mitsuyoshi, Chesner, Craig A., Nishida, Norimasa, Shimizu, Masahiro, Akasaka, Takeshi (2010) Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation. Mineralogy and Petrology, 99 (1) 133-141 doi:10.1007/s00710-009-0099-5 | Journal (article/letter/editorial) | | orthopyroxene, magnetite, ilmenite, fayalite,
zircon and allanite. YTT allanite crystals were separated...augite,
ilmenite, magnetite, hornblende, allanite, zircon, apatite
and almandine (Kurokawa and Sakai 2001;...accelerating voltage of 25 kV, a beam current of 10 nA, peak count
times of 10 s, background count times of 5...accelerating voltage of
25 kV with a beam current 50 nA, peak count times of 20 s,
background count times of 10...textures of the allanite with
apatite (Ap) and/or zircon (Zrn)
inclusions from (a) Youngest
Toba welded | 👁 Image
| Rao, N.V. Chalapathi, Wu, Fu-Yuan, Mitchell, R.H., Li, Qiu-Li, Lehmann, B. (2013) Mesoproterozoic U–Pb ages, trace element and Sr–Nd isotopic composition of perovskite from kimberlites of the Eastern Dharwar craton, southern India: Distinct mantle sources and a widespread 1.1Ga tectonomagmatic event. Chemical Geology, 353. 48-64 doi:10.1016/j.chemgeo.2012.04.023 | Journal (article/letter/editorial) | | Kotakonda cluster
KK-1 (Kotakonda)
Age (Ma)
Method
Reference
840 ± 33
1091 ± 20
851 ± 33
1092 ± 15
1350
1124...Narayanpet cluster; NKF): This
body is exposed about 1 km east of NK-1 and 1.75 km west of
Perapalli village. Few... NKF):
This kimberlite is exposed about 0.75 km east of Ammireddipalli
village. It has outcrop dimensions...sample by
microprobe) and NIST610 as an external reference material (Jackson et
al., 2004; Griffin et al....given in Table 2.
secondary ion beam intensities by peak jumping sequence. Each
measurement consists of 10 | 👁 Image
| | Journal (article/letter/editorial) | | of Vesta
Shiyong Liao, Weibiao Hsu
PII:
DOI:
Reference:
S0016-7037(17)30051-0
http://dx.doi.org/10.1016/j...impact-melt breccia, and present SIMS U-Pb ages of zircon and phosphates. NWA
8009 consists of coarse- and...plagioclase,
planar fractures and granular textures of zircon. These shock effects indicate NWA 8009 was
subjected...subjected to an impact metamorphism with peak pressure of ~50–60 Gpa and post-shock
temperature of ~1160–1200...system
at ca. 4.1–4.2 Ga. Based on evidence from zircon chemical zoning, petrographic occurrences,
as well | 👁 Image
| Lan, Zhongwu, Li, Xianhua, Chen, Zhong-Qiang, Li, Qiuli, Hofmann, Axel, Zhang, Yanbin, Zhong, Yan, Liu, Yu, Tang, Guoqiang, Ling, Xiaoxiao, Li, Jiao (2014) Diagenetic xenotime age constraints on the Sanjiaotang Formation, Luoyu Group, southern margin of the North China Craton: Implications for regional stratigraphic correlation and early evolution of eukaryotes. Precambrian Research, 251. 21-32 doi:10.1016/j.precamres.2014.06.012 | Journal (article/letter/editorial) | | ,
2004; Knoll et al., 2006; Gao et al., 2010). Zircon U–Pb ages from
intrusive rocks or interbedded volcanic...xenotime typically occurs
as overgrowths on detrital zircon and frequently forms during early
or burial diagenesis...diagenetic
xenotime population and the youngest detrital zircon population.
However, xenotime growth may also take...from the same unit, we report ages of detrital zircon
grains to provide a maximum depositional age and...feldspar; PQ = polycrystalline quartz grains; Z + Xe = zircon with xenotime overgrowths.
ca. 472 m in thickness | 👁 Image
| | Journal (article/letter/editorial) | | Corrections
derived from data for a suite of reference materials with diverse compositions can reduce...composition, which are therefore
well-matched to reference samples of the same mineral. This is generally...for Pb/U data from zircon, but even here the
effects on ages can be N10% for zircon with ∼1% U (Williams...disequilibrium. The 207Pb/206Pb age
has been used as the reference age for both 206Pb/238U and 208Pb/232Th,
with...granite–granodiorite in the
Idaho batholith, Idaho has reference IDMS data but only minimal
SHRIMP and EMP data | 👁 Image
| | Journal (article/letter/editorial) | | diamonds have been glacially transported from Antarctica (Carboniferous dates interpreted as emplacement);...compressibility
A for host; diamond; included mineral
peak in the spectra was demonstrably reproducible to...Raman reference data is used for (mineral, reference peak, pressure conversion factor, reference): (coesite...set at
2 cm− 1 with a slit width of 100 μm. The peak position of a well defined
ð1Þ
where A is the isobaric...inclusion and remnant pressure determinations
Raman peak cm− 1
Diamond Source/mine
Size mm/
shape
Colour | 👁 Image
| | Journal (article/letter/editorial) | | distributions are dominated by a peak at
~160 Ma, with a subordinate peak at ~175 Ma. Both ~160
and ~175...Paleozoic thermal peak remains relatively poorly known. Interpretation of
the post-peak cooling history...history of the IVZ has been complicated by complex and sometimes contradictory geochronological data for many...lower crustal lithologies, often as part of the peak metamorphic assemblage.
Rutile has been shown to...of rutile ideally placed to investigate the post-peak thermal evolution of
the lower crust during cooling | 👁 Image
| | Journal (article/letter/editorial) | | species, including simple atoms and ions and
more complex molecules and ionic species. To form a secondary...characterise the effects of orientation on a known reference material and the results are applied to the interpretation...1990) each
comprising 48 grains, and 15 grains of reference standard ’WHQ’ rutile (described later), were...shown in Table 1, along with the count
times on each peak. This run table, along with count times and collector...(EB-38 and EB-39) together with 15 additional WHQ reference standard analyses, were analysed.
In rutile, 208Pb | 👁 Image
| Ling, Xiao-Xiao, Schmädicke, Esther, Li, Qiu-Li, Gose, Jürgen, Wu, Rui-Hua, Wang, Shi-Qi, Liu, Yu, Tang, Guo-Qiang, Li, Xian-Hua (2015) Age determination of nephrite by in-situ SIMS U–Pb dating syngenetic titanite: A case study of the nephrite deposit from Luanchuan, Henan, China. Lithos, 220. 289-299 doi:10.1016/j.lithos.2015.02.019 | Journal (article/letter/editorial) | | been widely applied
for the age determination of zircon in metamorphic rocks. However,
nephrite formation...greenschist facies conditions. Therefore, accessory zircon in
290
X.-X. Ling et al. / Lithos 220–223 (2015)...reflect the time of nephrite formation. The age of zircon
can be considered as the upper limit for the age...recognized that the evolution of Qinling orogen is a
complex process (Wu and Zheng, 2013). The Luanchuan group...in the
Dahongkou Formation are dated by LA–ICPMS zircon U–Pb method
at ca. 1.6 Ga (Su et al., 2013), suggesting | 👁 Image
| | Journal (article/letter/editorial) | | https://doi.org/10.1016/j.icarus.2019.113531
Reference:
YICAR 113531
To appear in:
Received date:
...and glass to
avoid loss of volatile components. Peak counting times were 10 s for Na and K, 40 s
4
...Mass calibration was performed by centering the peak of 180Hf16O+. Ion signals of
Zr216O+, 204Pb+, 206Pb+...of around 13 min.
lP
Phalaborwa baddeleyite reference (age 2059.6 Ma, 206Pb/238U=0.3764) (Heaman,
2009;...zirconolite was not conducted due to lack of suitable reference materials,
Jo
ur
and because of possible matrix | 👁 Image
| Shen, Ting-ting, Wu, Fu-yuan, Zhang, Li-fei, Hermann, Joerg, Li, Xu-ping, Du, Jin-xue (2016) In-situ U–Pb dating and Nd isotopic analysis of perovskite from a rodingite blackwall associated with UHP serpentinite from southwestern Tianshan, China. Chemical Geology, 431. 67-82 doi:10.1016/j.chemgeo.2016.03.029 | Journal (article/letter/editorial) | | obtained. These ages are in agreement with the age of peak UHP metamorphism
in Chinese southwestern Tianshan...HP–UHP belt of Chinese
southwestern Tianshan in the east (Tagiri et al., 1995; Gao et al., 1999;
Volkova...Pseudosection
modeling of metapelites constrained peak P–T conditions of ~ 570 °C,
27–33 kbar (Lü et al...2009). Eclogites included in the
metapelites yield peak P–T conditions of 420–520 °C, 27 kbar (Lü
et al...lenses within the metapelites have experienced a complex metamorphic evolution recorded by the mineral assemblages | 👁 Image
| | Journal (article/letter/editorial) | | we present
new data syntheses and maps of U-Pb zircon and hornblende and biotite Ar
age distributions...path for the southeastern
section of the batholith east of the proto–Kern Canyon fault, support previous...thermochronologic color contour maps, which reveal
an east-west–trending older (and colder) swath within the...forces.
INTRODUCTION
Continental arcs preserve complex deformation histories imparted by subduction zone–forced...system in the south
(Fig. 1) appears to have a more complex polyphase history than shear zones
of the central |
|
