Zircon U–Pb dating from the mafic enclaves in the Tanzawa Tonalitic Pluton, Japan: Implications for arc history and formation age of the lower-crust

Suzuki, Kuninori; Yamamoto, Shinji; Sawaki, Yusuke; Aoki, Kazumasa; Omori, Soichi; Kon, Yoshiaki; Hirata, Takafumi; Li, Yibing; Takaya, Yutaro; Fujinaga, Koichiro; Kato, Yasuhiro; Maruyama, Shigenori

doi:10.1016/j.lithos.2014.02.010

Cited by 14 publications

(14 citation statements)

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“…2. It can be seen that the crystals have stubby euhedral shapes with colorless or pale pink, which are common characteristics of Tanzawa tonalities (Tani et al 2010;Suzuki et al 2014). All the crystals used in the magnetic measurements also showed a clear peak for zirconium in the XRF measurements.…”

Section: Zircon Preparationmentioning

confidence: 84%

“…5 Ma (Tani et al 2010). The typical grain size of the Tanzawa zircon ranges from 50 to 200 μm (Suzuki et al 2014), and we selectively collected coarse zircon crystals larger than 150 μm in size.…”

Section: Geology and Samplingmentioning

confidence: 99%

“…4-5 Ma using a sensitive high resolution ion micro probe and laser ablation-inductively coupled plasma mass spectrometry (Tani et al 2010;Suzuki et al 2014). Yamada and Tagami (2008) also reported (U-Th)/He zircon and apatite ages.…”

Section: Geology and Samplingmentioning

confidence: 99%

“…2m-o). Tanzawa tonalites mainly consist of plagioclase, hornblende, quartz, and biotite with minor amounts of K-feldspar, chlorite, magnetite, ilmenite, ± actinolite, ± muscovite, ± cummingtonite, and ± tremolite (Suzuki et al 2014). Note that the "±" denotes the way of description for minor minerals in the thinsection.…”

Section: Sample-selection Criteria For Future Study Of Paleointensitymentioning

confidence: 99%

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Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan

Sato

Yamamoto

et al. 2015

Earth Planet Sp

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This paper reports on the rock-magnetic properties of single zircon crystals, which are essential for future work establishing the reliable paleointensity method using single zircon crystals. Zircon crystals used in this study were sampled from the Nakagawa River, which crosses the Tanzawa tonalitic pluton in central Japan. Rock-magnetic measurements were conducted on 1037 grains of zircons, but many of these measurements are below the limits of the sensitivity of the magnetometers employed. Isothermal remanent magnetizations (IRMs) of 876 zircon crystal are below the practical resolution of this study; we infer that these crystals contain no or only minute quantities of ferromagnetic minerals. The other zircon crystals contain enough magnetic minerals to be measured in the DC SQUID magnetometer. Am 2 (80 zircons), combining the rock-magnetic parameter, we proposed the sample-selection criteria for future study of paleointensity experiments using single zircon crystals. In the case that the samples had high coercivity (B c ) values (>10 mT) or high M NRM /M IRM values (>~0.1), main remanence carriers are probably pyrrhotite and these samples are inappropriate for the paleointensity study. In the case that the samples had low B c values (<10 mT) and low M NRM /M IRM values (<~0.1), main remanence carriers seem to be nearly pure magnetite with pseudo-single-domain grain sizes, and these samples are expected to appropriate for the paleointensity study. Total thermoremanent magnetization (TRM) acquisition experiments were also carried out for 12 samples satisfying the above criteria. The TRM intensity was comparable with that of NRM, and a rough estimation of the paleointensity using NRM/TRM ratios shows field intensities consistent with the average geomagnetic field intensity at the Tanzawa tonalitic pluton for last 5 Myr.

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Section: Zircon Preparationmentioning

confidence: 84%

Section: Geology and Samplingmentioning

confidence: 99%

Section: Geology and Samplingmentioning

confidence: 99%

Section: Sample-selection Criteria For Future Study Of Paleointensitymentioning

confidence: 99%

See 2 more Smart Citations

Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan

Sato

Yamamoto

et al. 2015

Earth Planet Sp

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“…Concentration units in (a), (c)–(g), (i), and (l) are ppm. Data from previous studies (Kawate & Arima, ; Suzuki et al, ; Wang et al, ; Zhang et al, ) are included. Regression lines and correlation factors for individual indexes were calculated as exponent functions using all data (gray lines and characters) or all except for S ‐type granite data (red lines and characters).…”

Section: Discussionmentioning

confidence: 99%

Geochemical characteristics of zircons in the Ashizuri A‐type granitoids: An additional granite topology tool for detrital zircon studies

et al. 2017

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Zircon is resistant to alteration over a wide range of geological environments, and isotopic ratios within the mineral provide constraints on ages and their parental magmas. Trace element compositions in zircon are also expected to reflect those of their parent magmas, and have a potential as essential indicators for their host rocks. Because most detrital zircons that accumulate at river mouths are derived primarily from granitoids, the classification of zircon within granitoids is potentially meaningful. This study employs the conventional classification scheme of granites (I-, S-, M-, and A-types). To clarify geochemical characteristics of zircons in A-type granites, trace element compositions of zircons extracted from the A-type Ashizuri granitoids were examined. Zircons from the Ashizuri granitoids commonly show enrichments of heavy rare earth elements and positive Ce anomalies, indicating that these zircons were igneous in origin. In addition, zircons in these A-type granites are characterized by enrichments of Nb, Y, Ta, Th, and U and strong negative Eu anomalies, which exhibit good positive correlations with those in their whole rocks. This fact indicates that these signatures in zircons reflect well those in their parental bodies and are useful in identifying zircons derived from A-type granite. Based on compilations of available data, zircons from A-type granites can be clearly discriminated from other-types of granites within Nb/Sr-Eu anomaly, U/Sr-Eu anomaly, Nb/Sr-U/Sr, and Nb/Sr-Ta/Sr cross-plots. All indices used in these diagrams were selected based on the geochemical features of both zircon and whole rock of A-type granites. Application of these discrimination diagrams to detrital zircons will likely provide further insights. For example, some Hadean detrital zircons plot in similar fields to A-type granites, implying the existence of A-type magmatism in the Earth's earliest history. K E Y W O R D SAshizuri, A-type granite, HFSE, REE, zircon | INTRODUCTIONZircons are often used as geochronological and geochemical indicators for constraining the nature of their host rocks. Recent developments of analytical methods enable us to extract information concerning the host rock from a single zircon grain. As one such example, contribution rates of mature sediments into granitoid magma through geologic time have been examined based on compilations of oxygen isotope ratios of zircons extracted from granites (Valley et al., 2005) and of detrital zircons in river mouth sands (Iizuka et al., 2013). Belousova, Griffin, O'Reilly, and Fisher (2002) examined trace element contents in zircons from a variety of rock types and proposed some discrimination diagrams, but found that most rocks are inseparable except for peculiar rocks (kimberlite, carbonatite, and nepheline-syenite). Basically, most detrital zircons that accumulate at river mouths are derived primarily from granitoids (Hawkesworth, Cawood, Kemp, Storey, & Dhuime, 2009), and their U-Pb age populations reflect the age variation of the hinterlan...

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Detecting Micro‐ and Nanoscale Variations in Element Mobility in High‐Grade Metamorphic Rocks

Kusiak

Wilde

Wirth

et al. 2017

Microstructural Geochronology

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Zircon U–Pb dating from the mafic enclaves in the Tanzawa Tonalitic Pluton, Japan: Implications for arc history and formation age of the lower-crust

Cited by 14 publications

References 43 publications

Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan

Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan

Geochemical characteristics of zircons in the Ashizuri A‐type granitoids: An additional granite topology tool for detrital zircon studies

Detecting Micro‐ and Nanoscale Variations in Element Mobility in High‐Grade Metamorphic Rocks

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