Linzhi Gao

Chinese Academy of Sciences | CAS · Institute of Geology and Geophysics

It is a long-term objective for Chinese geologists to make the Meso-Neoproterozoic strata in North China Craton (NCC) the international reference section of the Late Precambrian chronostratigraphic stratigraphy. However, the establishment of highly precise and reliable Precambrian chronostratigraphic frame would be a top priority in current chronos...

本文对江南造山带东段、江绍断裂带北缘浙江省江山市上墅村、上余镇和上湖蓬村三个地区的流纹英安岩和熔结凝灰岩进行了年代学、地球化学、全岩Sr‐Nd和锆石Hf‐O同位素分析。三个地区熔结凝灰岩的SHRIMP锆石U‐Pb年龄分别为842.8±6.9 Ma 和 850.0±7.3 Ma, 839±9 Ma 和 832.2±8.1 Ma, 828.3±8.5 Ma 和 836.9±9.9 Ma。这些年龄证明它们比早前认为的上墅组的时代要早, 而小于近期认为的章村组。江山市这些火山岩总体上具有高SiO2 (54.08‐76.80 wt%) 和Al2O3 (12.40‐21.31 wt%), 低Fe2O3 (0.68‐8.92 wt%), MgO (0.29‐2.49 wt%), CaO (0.12‐2.8...

The Yunkai metamorphic complex in the southwestern Cathaysia block is mainly composed of the Tiantangshan Group, the Yunkai Group and the Paleozoic granitic rocks. The Tiantangshan Group is mainly composed of high grade metamorphosed gneisses, leptymtes and quartzkes. The Yunkai Group mainly consists of schists, slates, phyllites and metamorphosed...

In the Ediacaran-Cambrian transition, there existed a major mutation in the geological history of the Earth, during which a series of geological and biological events occurred along with the environment changes and life evolution. New materials of important macrofossil biota from South China show that, across the boundary formations of Precambrian-...

This paper reports SHRIMP zircon U-Pb (890±9 Ma, 834±34 Ma) and Hf isotopic analyses of tuff from Liubatang Formation of Qingbaikou System in Jinning County, Yunnan Province. The authors investigated the tectonic background and regional stratigraphic correlation in Yunnan and provided qualified data for the stratigraphic correlation between South C...

Neoproterozoic strata in South China consist of Qingbaikouan, Nanhuan and Sinian systems in Chinese Time Scale which can be respectively correlated with Tonian, Cryogenian and Ediacaran systems in the International Time Scale. The South China area is subdivided into two parts, i.e., Upper and Lower Yangtze blocks. Traditionally, the Jinning Movemen...

Zircon dating of tuff bedding from the Wengjialing Formation in the east segment of the Jiangnan orogenic belt within northeast Jiangxi Province is reported for the first time in this paper (841.2±5.1 Ma), which constrains the age of the Wengjialing Formation, suggesting that it lies above Tianli schist and beneath the Taoyuan Formation. In combina...

Zircon dating (840Ma±5Ma) of tuff bedding is reported for the first time for the sixth member of the Huixiangping Formation in the Fanjingshan Group. The SHRIMP U-Pb dating of detrital zircon of the Furongba Formation is combined with tuff zircon dating (813.5Ma±9.6Ma) of the Xinzhai Formation in Xiajia Groups in Guizhou and Hunan Provinces, and al...

This paper reports SHRIMP zircon U-Pb ages (908~878Ma) of andisite and tuff of the Early Neoproterozoic Shuanxiwu Group on the northern side of the Jiangshan-Shaoxing faulted zone and discusses the tectonic background and regional stratigraphic correlation and tectonic evolution of the Jiangshan-Shaoxing faulted zone. The SHRIMP U-Pb ages and geoch...

A series of parametamorphic rocks, as the oldest metamorphosed basement in the Jiangshan-Shaoxing fault zone, consist of gneiss, schist and marble of medium-deep metamorphism and are in fault contact with the Shuangxiwu Group in Chencai area, Zhuji County, Zhejiang Province. Because the Chencai Group which suffered deep metamorphism and deformation...

The outcropped Neoproterozoic strata are relatively complete from old to young in Lushan area, and hence this area is significant for analyzing the tectonic evolution of the whole "Jiangnan Orogen". The Hanyangfeng Formation, which exists only in Hanyang peak of the Lushan Mountain, is mainly composed of terrestrial eruptional metacrystal or phenoc...

The Fanjingshan Group, outcropped in the northeastern part of Guizhou Province, is over 10000 m thick succession of strongly-deformed, low-grade metamorphic volcanic rocks and terrigenous clastic rock, overlaid unconformably by the Xiajiang Group. It is divided into 2 sub-groups: Baiyansi sub-Group and Hetaoping sub-Group in ascending order. Sample...

The Qingbaikouan System is the lowest unit of the Neoproterozoic Erathem in Chinese stratigraphic succession, and it now provides a precise geochronological framework and geological time scale for mapping and stratal correlation in China. However, a sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon age date (1368±12 Ma) obtained from a...

In the zircon study of bentonite from the Danzhou Group and overlying strata of the Nanhua System, the authors accurately determined the age of (801+3) Ma for zircon from the Hedong Formation and (778+6) Ma for zircon from the Gongdong Formation. (778±5) Ma is the age of zircon from the Chang' an Formation, which is the bottom of the Nanhuan System...

This paper will report some SHRIMP U-Pb ages (1132 Ma±8 Ma, 1140 Ma±7 Ma, 1143 Ma±9 Ma and 1172 Ma±10 Ma) of meta-rhyolite of the Tieshajie Formation in the Jiao-Shao fault zone, which belongs to the Northern margin of Cathaysia. Combine of those dating, we will try to discuss the tectonic set of the Tianli schist, Zhoutan Complex and Wanyuan Compl...

Zircon ages (825 Ma±5 Ma) and (830 Ma±6 Ma) of tuff in the Chentangwu Formation are reported for the first time from the "Pingshui Group" in Pujiang County, Zhejiang Province. In combination with the SHRIMP U-Pb age (824 Ma±5 Ma) of the tuff from the Xiushui Formation and 825 Ma±5 Ma of the rhyolite from Xingzi complex Group and the SHRIMP U-Pb age...

Abundant large acanthomorphic acritarchs from the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China are becoming useful tools for biostratigraphic subdivision and correlation of the Ediacaran System despite limitations caused by facies control, taphonomic bias and taxonomic problems. Based on thin-section examination of chert s...

Ceratosphaeridium Grey, 2005 is a key taxon of ECAP (Ediacaran complex acritarch palynoflora,) in the Officer and Amadeus basins, South Australia. Recently, several specimens of Ceratosphaeridium were fortuitously observed from the Member III of the Ediacaran Doushantuo Formation in the Yangtze Gorges, South China. The discovery of Ceratosphaeridiu...

The hypothesis of the "Snow Earth" pours new vitality into the study of the global Neoproterozoic glaciations. According to the development of glaciations in different continents, isotopic dating, ratios of δ13C/δ18O and CIA, four glaciations have been recognized in the whole globe along different sections in different continents. The change of the...

Zircon U-Pb ages (SHRIMP and LA-ICPMS) and Lu-Hf isotope data (LA-ICPMS) are presented for two granite and two quartzite pebbles from the basal conglomerates of the Sijizhuang Formation in the Hutuo Group from the Wutai Mountains area in the North China Craton. These two granite pebbles give zircon 207Pb/206Pb ages of 2513±8 Ma and 2527±8 Ma respec...

Zircon dating of tuff bed in the Xiushui Formation of the Shuangqiaoshan Group has yielded an age of 824 Ma±5 Ma, with MSWD equal to 1.3, and there are three groups of zircon U-Pb ages for the Majianqiao Formation, of which, one is identical with the age of the Xiushui Formation (824Ma±5Ma, MSWD=1.9), and the youngest age is 769Ma±8Ma (MSWD=0.55)....

The aim of this study is to discuss the microfossils in phosphate deposit in the Doushantuo stage, Sinian System, Weng’an, Guizhou Province. Based on the detailed observation in morphology and microstructures, it is considered that those acritarchs with interior spicules probably belong to sponge animals. However, some explanations for a part of so...

In a re‐study of regional geology by the China Geological Survey (CGS), the key problem is in the stratigraphical division and correlation. According to the new isotopic dating of the Meso‐ and Neoproterozoic in China, there have been great changes in the strata correlation and tectonic explanation. The authors obtained four zircon sensitive high r...

This paper reports a SHRIMP U-Pb age (855 Ma ± 5 Ma) of metamorphic tuff from the Fengzichong Complex-Formation. Although zircons have different forms, their CL images show typical magmatic oscillatory zoning. The zircons have relatively high content of U and Th, with Th/U ratios vary in the range of 0.32~0.87. Therefore, they are of magmatic origi...

Zircon dating of the tuff bed in Lengjiaxi Group of Hunan Province was conducted in this study. In combination with the SHRIMP U-Pb dating of the tuff bed in Sibao and Shuangqiaoshan groups, the Lengjiaxi Group is considered to be Neoproterozoic in age. The isotopic data obtained are very important in redefining the age of the Lengjiaxi Group and i...

Lower Cambrian strata are well developed in Hunan. With the main sedimentary formations of black shale and carbonates in western and central Hunan and a suite of greywacke and carbonaceous slate with different thicknesses of rhythmic layers in southern area, the Lower Cambrian in the study area constitutes a second-order sequence, which can be furt...

Epicontinental seismicity is currently a subject of intense study by geologists and engineers, particularly relative to triggering mechanisms, epicentral areas, and recurrence intervals. Aside from modern seismic events, much of the evidence for previous events is in the form of soft-sediment deformation, which has often been systematically overloo...

Large acanthomorphic acritarchs have been found in chert of the Ediacaran Doushantuo Formation at several localities in South China, including the East Yangtze Gorges of Hubei Province, Weng'an area of Guizhou Province, and elsewhere. However, their potential for biostratigraphic subdivision and correlation of Ediacaran successions is limited by fa...

New dates from Meso‐ and Neoproterozoic strata contribute to the recently defined Precambrian stratigraphical timescale of China agreed by the Subcommission on the Precambrian System, and the National Commission on Stratigraphy of China on Nov. 24, 2009. First, the age range of the Changcheng System, including the Changzhougou, Chuanlinggou, Tuansh...

Abstract Molar tooth structure (MTS) represented by complex ptygmatical shapes is widely distributed in the Proterozoic of the world. MTS filled by fine, equant sparry calcite (or dolomite) displays an abrupt contact with hosting rocks, which are mainly composed of carbonaceous micrites and fine-grained carbonates with local silts and stormdominate...

Abstract  Using the reported new U-Pb age with the Sensitive High-Resolution Ion Microprobe (SHRIMP II), zircon U-Pb ages were obtained from two samples of K-feldspar felsic paragneiss and K-feldspar gneissoid trondhjemite on the southern margin of the Taihang Mountains in the North China Craton. The protolith of the K-feldspar felsic paragneiss is...

A new macrofossil Lagerstätte was discovered from the uppermost Ediacaran Jiucheng Member at Jinning and Jiangchuan of the eastern Yunnan, yielding numerous diverse well-preserved thallophyte macrofossils. These include the previously-known representatives of vendobionts, Vendotaenia and Tyrasotaenia, and the biggish multicellular benthos such as C...

This paper gives a summary of the fossil data from the Sinian Doushantuo' an Lantian Formation in the Xiuning area, Anhui Province, China, and reports the genital butt structure comparable to that of some modern advanced algae and the fossil structure comparable to the dehiscence of sporangia as well as the ontogenetic phenomenon occurring possibly...

Zircon dating age of tuff bedding from the Sibao Group in Guangxi and Guizhou provinces is firstly reported in this paper. Integrating the zircon SHRIMP U-Pb dating of the granite which intruded into the Sibao Group, the group is thus determined to be Neoproterozoic. The Sibao Group (same as the Fanjingshan, Lengjiaxi and Shuangqiaoshan groups) and...

Some zircon dating data of the tuffaceous bed are reported for the first time from the Sibao and Xiajia groups in Guanxi and Guizhou. In combination with the SHRIMP U-Pb dating of the granite that intruded into the Sibao Group, the Xiajia Group is determined to be of Late Neoproterozoic. These isotopic data are very important for us to redefine the...

The newly marked Precambrian stratigraphic column of China was discussed by the Subcommission on Precambrian of National Commission on Stratigraphy of China on November 24, 2009. According to the common understanding reached at this meeting, Changcheng System comprising Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu Formations is limited in 1....

The upper limit line of the deposition of the Diaoyutai Formation is given by distributional pattern of detrital zircon age from the Diaoyutai Formation, Xihe Group, Qingbaikou System. The main volume of the distributional pattern of detrital zircon age is 1.6 Ga and the youngest age is 1075 Ma, which reflects the depositional age is younger than 1...

Based on an investigation of the sedimentary characteristics of the Nanhuan diamictite (tillite) by means of grain size analysis and provenance discrimination of sandstone, the authors tentatively established the Nanhuan -Sinian sedimentary sequences in the southwestern margin of Tarim Basin. It is concluded that the Nanhuan diamictite (tillite) an...

Neoproterozoic glaciations of Quruqtagh area in Tarim basin are recognized, four of which appear to be global and with different volcanic rocks. In recent years, "Snow earth" hypothesis put forwards to the study of glaciation, any advancement of sedimentary, depositional environment and glaciation chronostratigraphic dating for the four glaciations...

: The late Cenozoic geomorphic features and geochronologic data of the Zhingfang River catchment in the Yuntaishan World Geopark are studied. Several quarternary geochronologic methods, including electron spin resonance (ESR), optically stimulated luminescence (OSL), thermo-luminescence (TL) and U-series are presented in this paper. The results sug...

The Ediacaran is characterized by diversification of many groups in microfossils record, including filamentous cyanobacteria, multicellular algae and acritarchs. A new microfossils assemblage from the Ediacaran Doushantuo Formation at Zhangcunping, northern Yichang, China, includes filamentous cyanobacteria ( Oscillatoriopsis, Polytrichoides, Salom...

: High-quality zircon U-Pb ages acquired from Meso- and Neoproterozoic strata in North China in recent years has provided a high-resolution chronostratigraphic framework for dating. A basis of this high-level chronostratigraphic system provides the foundation for a global Precambrian study and stratigraphic correlation and so recent geological stud...

The ediacaran Doushantuo Formation in the Yangtze Gorges area (Fig. 1.2) contains abundant silicified cyanobacterial coccoids and filaments (Y. Zhang et al., 1998), acanthomorphic acritarchs (Zhou et al., 2007), multicellular algae (Xiao, 2004), and possible animal embryos (L. Yin et al., 2007). These silicified fossils are taxonomically similar to...

This paper reports for the first time on the microfossils discovered in the black cherts of the basal part of the Lower Cambrian Shuijingtuo Formation at Miaohe village, Zigui County, Hubei Province, all of which were observed in thin sections. Nine genera, 9 species and 3 indeterminate species (including a new species) are described. According to...

Abstract On the basis of the records of strong seismic events taking place in soft carbonate sediments, a new seismic sequence system of vibrational liquefaction is established, which consists of a series of units, such as escaped structure of micrite veins and liquefied deformation formed in the period of seismic liquefaction, land subsidence stru...

Abstract On the basis of a study of the acanthomorphic acritarchs discovered in the Late Proterozoic to Early Cambrian Meishucunian Stage in different regions of China, especially in southern Shaanxi and the Yangtze Platform, coupled with a study of the assemblages, morphological correlation, microstructure, and evolutional relations of the acantho...

Abstract This paper studies, for the first time, the storm deposits of a carbonate sequence in the Sinian Zhangqu Formation in northern Anhui. In the formation, a great number of calcareous trider sponge spicules were discovered in a distal storm turbidity sequence, which have provided further evidence for the correlation of the Sinian Systems in N...

We report the results of a comprehensive isotopic investigation of zircons from metamorphosed tonalites and amphibolites from Lushan in the far south of the Trans-North China Orogen of the North China Craton that reveal the oldest rocks yet dated from the orogen. A detailed investigation of the internal structures of zircons, combined with targeted...

The Zhangcunping area is located at the north limb of the Huangling anticline in Yichang, Hubei Province. Here, the sedimentary succession of the Ediacaran Doushantuo Formation is similar with that in the Weng’an area, Guizhou Province. A large number of new microfossils (mainly acanthoacritarchs) from the Doushantuo Formation in this area are repo...

The affinity of phosphatized globular fossils, one of the important types in the Ediacaran Weng'an biota, was first interpreted as that of green algae. Later, some researchers interpreted these fossils as animal resting eggs and embryos based on the fact that these globular fossils show similar features to early cleavage stages of meta-zoan embryos...

The Mesoproterozoic Chuanlinggou Formation (ca. 1.7 Ga) consists mainly of dark-gray to black shales that are widespread in the North China Platform. Abundant centimeter-scale sand veins are present within the shale layers of this unit, particularly in the middle part. Sand veins display ptygmatic shapes, perpendicular or with a high angle to beddi...

A large number of zircons were obtained from three samples of bentonite in the Hengyong and Anleling formations of the Shuanqishan Group and Heshangzhen Group. They yielded weighted mean 206Pb/238U ages of 831±5 Ma for the Hengyong Formation, 829±5 Ma for the Anleling Formation and 767±5 Ma for the Shangshu Formation of the Heshangzhen Group by the...

Shales of the Ediacaran Doushantuo Formation of South China contain a new disc-shaped macrofossil, Eoandromeda octobrachiata, characterized by eight spiral arms that were probably housed within an outer membrane. Although the presence of eight radiating structures entails a resemblance to cnidarian octocorals as well as to ctenophores, direct homol...

Zircon grains of magmatic origin from tuffite layers in the Xiamaling Formation at Zhaojiashan Village, Xuanhua area, Hebei Province, were used for zircon dating with a Sensitive High-Resolution Ion Microprobe (SHRIMP II), which gives a weighted mean 207Pb/206Pb age of 1366±9 Ma. It shows a very similar age (1368±12 Ma) as the zircon dating from th...

Much attention has long been paid to the chronology of rapakivi granite in Miyun because it formed simultaneously with the destruction of the North China craton and initiation of the Mesoproterozoic Yanliao rift. High-quality SHRIMP ages were lacking though some data available could be used as reference. The authors for the first time obtained a we...

The Miaohe Biota in shales of the Edicaran (Sinian) Doushantuo Formation at Miaohe, Zigui County, Hubei Province and Wenghui, Jiangkou County, Guizhou Province, South China, mainly consists of the carbonaceous compression macrofossils recognized as the diverse benthic assemblage including a large amount of multicellular algae and some forms of the...

This paper provides a systematic treatment of tubular microfossils collected from dolomitic phosphorites of the Ediacaran Doushantuo Formation at Weng’an, South China. These microfossils were investigated using petrographic, acid extraction and re-embedding techniques. Four morphological genera and five morphospecies are described: Ramitubus incres...

Setting up the hypostratotype of late Precambrian is the main aim of the research on the Meso- and Neoproterozoic in North China. The chronostratigraphic position is the key in this study. However, many key horizons have not been calibrated with the high-quality isotopic ages. Using the reported new U-Pb age with the Sensitive High-Resolution Ion M...

Meso- and Neoproterozoic strata are very well developed in the southern Ural Trough. They have a huge thickness and show distinct features of tectonic evolution and deposition of several stages. The Neoarchean and Lower Riphean are important host strata of large stratabound iron and magnesite deposits. The Middle Riphean (Mesoproterozoic) has very...

Whether or not Grenvillian orogeny occurred in South China still remains highly controversial because high-quality, discriminating data are lacking, and therefore, the key to resolve this matter is to find datable volcanic and/or sedimentary rocks related to Grenvillian orogeny. Such rocks are apparently present in the Fuliangpeng Member from the l...

: In the Mesoproterozoic time, the northern part of the Sino-Korean Plate experienced a period of intensive tectonic extension and breakup. 1. An abundance of sedimentary earthquake records is preserved in the Chuanlinggou, Tuanshanzi and Gaoyuzhuang formations in the Mesoproterozoic Changcheng System (1800-1400 Ma) and in the Mesoproterozoic Wumis...

A morphologically more diverse assemblage of Longfengshaniaceae has been found in the uppermost Ediacaran (Sinian) Jiucheng Member, Yuhucun Formation at Jinning and Jiangchuan, eastern Yunnan, South China. A majority of them are different from the Longfengshania found in the Neoproterozoic Changlongshan Formation, Yanshan Mountain area, North China...

Located in the northern Sino-Korean plate, the Yanliao aulacogen is a region of very thick Meso-Neoproterozoic sediments. The Meso-Neoproterozoic consists of the Changchengian (1800-1600 Ma), Jixianian (1400-1200 Ma) and Qingbaikouan (1000-800 Ma) systems. The above-mentioned stratigraphic division is the consensus reached by Chinese geologists thr...

Soft-sediment structures are key to defining seismites. Two soft-sediment deformation horizons, bounded by undeformed carbonate strata, have been found in the Wumishan Formation in the Jumahe region, 175 km southwest of Beijing. One is in the lowest part of Wumishan Formation; and the other is in the uppermost part of Litho-member I. The soft-sedim...