Lower Devonian trace fossils and their paleoenvironmental significance from the western Yangtze Plate, South China

Li-jun ZHANG; Zhao ZHAO

Makale detayları

Lower Devonian trace fossils and their paleoenvironmental significance from the western Yangtze Plate, South China

Yazarlar:

Li-jun ZHANG | Zhao ZHAO

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2015 Vol.24 Issue 4

Belge Tipi:

Makale

Yayın Tarihi:

8/2015

Belge Dili:

Türkçe

Document ID (Org No.):

2000731448

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

Abundant and diverse trace fossils occur in the littoral-neritic sediments recording an Early Devonian transgression in South China. The well-exposed Ganxi section is located in the Longmen Mountain 100 km northwest of Chendu, Sichuan. The Lower Devonian strata are dominated by sandstones, siltstones, muddy shales, limestones, bioclastic limestones, and muddy limestones. About thirteen ichnogenera were systematically described, including Arenicolites, ?Balanoglossites, Chondrites, Cylindrichnus, Diplocraterion, Planolites, Palaeophycus, Phycodes, Rhizocorallium, Rusophycus, Skolithos, Thalassinoides, and Zoophycos. Six trace fossil associations under different sedimentary environments have been recognized as follows: the Skolithos and Diplocraterion-Skolithos associations mainly consist of domichnia derived from a high-energy zone of the foreshore to upper shoreface; the Rusophycus-Phycodes association is characterized by fodinichnia and cubichnia generated in a lower-energy zone of the upper shoreface; the Chondrites-Palaeophycus association mainly consists of domichnia, chemichnia, and fodinichnia as indicators of the lower-energy and suboxic conditions of a coastal lagoon; the Rhizocorallium association includes feeding and dwelling burrows formed in a lower-energy zone of the upper offshore enriched with food; and the Zoophycos association is characterized by fodinichnia and pascichnia as indicators of the lower offshore frequently influenced by storm waves. The entire sequence shows several transgressive-regressive cycles from the Lochkovian to Pragian and much storm influence in the Emsian.

 

Abundant and diverse trace fossils occur in the littoral-neritic sediments recording an Early Devonian transgression in South China. The well-exposed Ganxi section is located in the Longmen Mountain 100 km northwest of Chendu, Sichuan. The Lower Devonian strata are dominated by sandstones, siltstones, muddy shales, limestones, bioclastic limestones, and muddy limestones. About thirteen ichnogenera were systematically described, including Arenicolites, ?Balanoglossites, Chondrites, Cylindrichnus, Diplocraterion, Planolites, Palaeophycus, Phycodes, Rhizocorallium, Rusophycus, Skolithos, Thalassinoides, and Zoophycos. Six trace fossil associations under different sedimentary environments have been recognized as follows: the Skolithos and Diplocraterion-Skolithos associations mainly consist of domichnia derived from a high-energy zone of the foreshore to upper shoreface; the Rusophycus-Phycodes association is characterized by fodinichnia and cubichnia generated in a lower-energy zone of the upper shoreface; the Chondrites-Palaeophycus association mainly consists of domichnia, chemichnia, and fodinichnia as indicators of the lower-energy and suboxic conditions of a coastal lagoon; the Rhizocorallium association includes feeding and dwelling burrows formed in a lower-energy zone of the upper offshore enriched with food; and the Zoophycos association is characterized by fodinichnia and pascichnia as indicators of the lower offshore frequently influenced by storm waves. The entire sequence shows several transgressive-regressive cycles from the Lochkovian to Pragian and much storm influence in the Emsian.

Makale detayları

Lower Devonian trace fossils and their paleoenvironmental significance from the western Yangtze Plate, South China

Yazarlar: Li-jun ZHANG | Zhao ZHAO

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2015 Vol.24 Issue 4

Belge Tipi: Makale

Yayın Tarihi: 8/2015

Belge Dili: Türkçe

Document ID (Org No.): 2000731448

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Li-jun ZHANG | Zhao ZHAO

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2015 Vol.24 Issue 4

Belge Tipi:

Makale

Yayın Tarihi:

8/2015

Belge Dili:

Türkçe

Document ID (Org No.):

2000731448

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985