The Petro-geochemical Characteristics and Stratigraphic Significance of the Volcanic Event Layer in Mid-Taiyuan Formation from Middle Region of Shanxi and Western Region of Hebei

Jia Bingwen; Gu Dongqi

Results of research on the petrological, petrochemical, rare elements′and trace elements′character-istics of the volcanic event layers in Mid-Taiyuan Formation from middle region of Shanxi and western region of Hebei are presented. Petro-geochemical features, REE distributions, seven-even-numbered- el-ement curves of REE and ratio spiderg rams of trace elements for these pyroclastic rocks perfectly resem-ble, and according to the application of the theory of power function, these pyroclastic rocks considered here should belong to the isochronal products of the same resource, coming from the calc-alk volcanic eruption in island-arc part. The discovery of the isochronal pyroclastic rocks provide the significant in-formation for the division and correlation of strata. In this paper, we can take these volcanic event layers as a marker bed to make regional strata correlation in this area.

Department of Resource and Environment Engineering, Shanxi Mining College Taiyuan 030024

Received Date: 1997-06-16

Rev Recd Date: 1997-07-25

Publish Date: 1998-12-10

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Abstract: Results of research on the petrological, petrochemical, rare elements′and trace elements′character-istics of the volcanic event layers in Mid-Taiyuan Formation from middle region of Shanxi and western region of Hebei are presented. Petro-geochemical features, REE distributions, seven-even-numbered- el-ement curves of REE and ratio spiderg rams of trace elements for these pyroclastic rocks perfectly resem-ble, and according to the application of the theory of power function, these pyroclastic rocks considered here should belong to the isochronal products of the same resource, coming from the calc-alk volcanic eruption in island-arc part. The discovery of the isochronal pyroclastic rocks provide the significant in-formation for the division and correlation of strata. In this paper, we can take these volcanic event layers as a marker bed to make regional strata correlation in this area.

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Reference (11)

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The Petro-geochemical Characteristics and Stratigraphic Significance of the Volcanic Event Layer in Mid-Taiyuan Formation from Middle Region of Shanxi and Western Region of Hebei

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