長崎県野母半島樺島花崗岩産ジルコンのU-Pb年代

充弘 長田; 吉一 高地; 茂 大藤

doi:10.5575/geosoc.2020.0011

長崎県野母半島樺島花崗岩産ジルコンのU-Pb年代

Translated title of the contribution: Early Cretaceous U-Pb dates of zircons from the Kabashima Granite in the Nomo Peninsula, Nagasaki Prefecture, SW Japan

長田充弘, 高地吉一, 大藤茂

Earth System Science

Research output: Contribution to journal › Article › peer-review

Abstract

The Kabashima Granite has intruded the pre-Cretaceous geological unit in Kabashima Island near the southern tip of the Nomo (Nagasaki) Peninsula, Nagasaki Prefecture, western Kyushu, Japan. Although previous studies have reported Late Cretaceous (ca. 93-77 Ma) muscovite and biotite K-Ar dates from this granite body, we obtained only Early Cretaceous (ca. 125-110 Ma) zircon U-Pb dates; the dates were calculated from all the ²⁰⁶Pb/²³⁸U and ²⁰⁷Pb/²³⁵U data sets with the error-ellipse (2σ) intersecting the concordia curve on the concordia diagram. The difference between the muscovite and biotite K-Ar and zircon U-Pb dates is between 25 million and 40 million years.

Translated title of the contribution	Early Cretaceous U-Pb dates of zircons from the Kabashima Granite in the Nomo Peninsula, Nagasaki Prefecture, SW Japan
Original language	Japanese
Pages (from-to)	333-339
Number of pages	7
Journal	地質学雑誌
Volume	126
Issue number	6
DOIs	https://doi.org/10.5575/geosoc.2020.0011
State	Published - 2020/06/15

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title = "長崎県野母半島樺島花崗岩産ジルコンのU-Pb年代",

abstract = "The Kabashima Granite has intruded the pre-Cretaceous geological unit in Kabashima Island near the southern tip of the Nomo (Nagasaki) Peninsula, Nagasaki Prefecture, western Kyushu, Japan. Although previous studies have reported Late Cretaceous (ca. 93-77 Ma) muscovite and biotite K-Ar dates from this granite body, we obtained only Early Cretaceous (ca. 125-110 Ma) zircon U-Pb dates; the dates were calculated from all the 206Pb/238U and 207Pb/235U data sets with the error-ellipse (2σ) intersecting the concordia curve on the concordia diagram. The difference between the muscovite and biotite K-Ar and zircon U-Pb dates is between 25 million and 40 million years.",

keywords = "Cretaceous, granite, Kyushu, Nagasaki metamorphic rocks, Suo metamorphic rocks, U-Pb dating, zircon",

author = "充弘長田 and 吉一高地 and 茂大藤",

year = "2020",

month = jun,

day = "15",

doi = "10.5575/geosoc.2020.0011",

language = "日本",

volume = "126",

pages = "333--339",

journal = "地質学雑誌",

issn = "0016-7630",

publisher = "Geological Society of Japan",

number = "6",

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TY - JOUR

T1 - 長崎県野母半島樺島花崗岩産ジルコンのU-Pb年代

AU - 長田, 充弘

AU - 高地, 吉一

AU - 大藤, 茂

PY - 2020/6/15

Y1 - 2020/6/15

N2 - The Kabashima Granite has intruded the pre-Cretaceous geological unit in Kabashima Island near the southern tip of the Nomo (Nagasaki) Peninsula, Nagasaki Prefecture, western Kyushu, Japan. Although previous studies have reported Late Cretaceous (ca. 93-77 Ma) muscovite and biotite K-Ar dates from this granite body, we obtained only Early Cretaceous (ca. 125-110 Ma) zircon U-Pb dates; the dates were calculated from all the 206Pb/238U and 207Pb/235U data sets with the error-ellipse (2σ) intersecting the concordia curve on the concordia diagram. The difference between the muscovite and biotite K-Ar and zircon U-Pb dates is between 25 million and 40 million years.

AB - The Kabashima Granite has intruded the pre-Cretaceous geological unit in Kabashima Island near the southern tip of the Nomo (Nagasaki) Peninsula, Nagasaki Prefecture, western Kyushu, Japan. Although previous studies have reported Late Cretaceous (ca. 93-77 Ma) muscovite and biotite K-Ar dates from this granite body, we obtained only Early Cretaceous (ca. 125-110 Ma) zircon U-Pb dates; the dates were calculated from all the 206Pb/238U and 207Pb/235U data sets with the error-ellipse (2σ) intersecting the concordia curve on the concordia diagram. The difference between the muscovite and biotite K-Ar and zircon U-Pb dates is between 25 million and 40 million years.

KW - Cretaceous

KW - granite

KW - Kyushu

KW - Nagasaki metamorphic rocks

KW - Suo metamorphic rocks

KW - U-Pb dating

KW - zircon

UR - https://cir.nii.ac.jp/crid/1390567901488399360

U2 - 10.5575/geosoc.2020.0011

DO - 10.5575/geosoc.2020.0011

M3 - 学術論文

SN - 0016-7630

VL - 126

SP - 333

EP - 339

JO - 地質学雑誌

JF - 地質学雑誌

IS - 6

ER -

長崎県野母半島樺島花崗岩産ジルコンのU-Pb年代

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