Water contrast between Precambrian and Phanerozoic continental lower crust in eastern China [PDF]
Journal of Geophysical Research: Solid Earth, 2008 The presence of water, even in small amounts, in the continental lower crust may play a critical role in its physical and chemical properties and behavior. However, the environment and evolution of water in the deep crust remain poorly constrained. Investigation of water, dissolved as H‐related point defects in minerals of lower crustal granulites, may
Yang, Xiao-Zhi +4 more
openaire +3 more sources
Precambrian Research, 2019 The Tarim block in NW China consists of a Precambrian basement and late Neoproterozoic to Paleozoic cover sequences. In order to better understand its roles in Precambrian supercontinent evolution, we used SHRIMP and LA-ICPMS U-Pb methods to date late ...
Chuan-Lin Zhang +2 more
exaly +2 more sources
Characteristics and geochemistry of Precambrian ophiolites and related volcanics from the Istanbul-Zonguldak Unit, Northwestern Anatolia, Turkey: following the missing chain of the Precambrian South European suture zone to the east [PDF]
, 2021 The Precambrian metamorphic basement of the Istanbul-Zonguldak Unit (IZU), NW Anatolia, Turkey, is represented by the Sunnice Group, composed essentially of four different metamorphic assemblages: (1) Cele metaophiolite, (2) Yellice metavolcanics, (3 ...
Yigitbas, E +4 more
core +2 more sources
Sr-Nd isotope geochemistry of the early Precambrian sub-alkaline mafic igneous rocks from the southern Bastar craton, Central India [PDF]
, 2009 Sr–Nd isotope data are reported for the early Precambrian sub-alkaline mafic igneous rocks of the southern Bastar craton, central India. These mafic rocks are mostly dykes but there are a few volcanic exposures.
Ellam, R.M. +5 more
core +1 more source
Interstratal dewatering origin for polygonal patterns of sand-filled cracks: a case study from late Proterozoic metasediments of Islay, Scotland [PDF]
, 1998 Sand-filled cracks from the Lower Fine-grained Quartzite of Dalradian (late Proterozoic) age on the Island of Islay, western Scotland, may be divided into two main types, both of which form orthogonal and non-orthogonal closed patterns on bedding ...
Tanner, P.W.G
core +1 more source
The Lower Precambrian in the structure of paleozoic in the Subpolar Urals
Доклады Академии наук, 2019 In many polymetamorphic complexes of the Urals, rocks with Early Precambrian age marks have been established. But only with respect to the two polymetamorphic complexes located on the western slope of the Southern Urals: the Taratash and Aleksandrov, their indisputable belonging to the Archean-Paleoproterozoic section is recognized.
Yu. I. Pystina +2 more
openaire +2 more sources
, 2021 Continental mafic igneous rocks and their xenocrysts provide information on the evolution of deep continent. Here we present new in situ U-Pb and Hf-O isotopes data for xenocrystic zircons discovered from the Late Mesozoic ultrapotassic to K-rich ...
Ma, Qiang +7 more
core +1 more source
Episodic growth of Precambrian lower crust beneath the North China Craton: A synthesis
, 2012 A comprehensive review of U-Pb geochronology and Hf isotopes of zircons separated from granulite xenoliths entrained in Phanerozoic magmatic rocks and inherited xenocrysts from the associated lower crust rocks from various domains of the North China ...
Ying, JF +11 more
core +1 more source
Onshore-offshore patterns in Late PreCambrian and Lower Palaeozoic trace fossils [PDF]
The Paleontological Society Special Publications, 1992 There was a dramatic increase in abundance and diversity of trace fossils in Upper Precambrian and Lower Cambrian shallow water seas. The trace-producing animals rapidly filled all the available niches and in low energy, muddy, environments they evolved winding, meandering and patterned habits. Traces such as Taphrhelminthopsis, Helminthoida, Nereites,
T. Peter Crimes, N. Chris Hunt
openaire +1 more source
Potassium metasomatism of Precambrian paleosols
, 2015 FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOIndependent of substratum composition, ancient regoliths formed by subaerial weathering are characterized by accumulation of K and other alkaline elements.
Alexey A. Novoselov +1 more
core +1 more source