Palynological constraints on the age of the Mississippi Valley-type Changdong Pb-Zn deposit, Sanjiang belt, West China

Liu, Yingchao; Song, Yougui; Hou, Zhenshan; Xi, Dangpeng; Su-ping, LI; Yue, Longlong; Ma, Weiqiang; Tang, Bolang

doi:10.1007/s11430-020-9838-4

Cited by 10 publications

(2 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All of the typical deposit fluids listed above show that the mineralization stage evolves from early to late, from high to low temperature, with increasing meteoric water and decreasing salinity. The low-salinity and low-density characteristics are distinctly different from the typical MVT formed in a stable basin where the mineralizing fluid is a high-salinity, high-density thermal brine [43][44][45][46].…”

Section: H and O Isotope Compositionsmentioning

confidence: 73%

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

2023

View full text Add to dashboard Cite

The Tuotuohe region is a highly prospective area for Pb and Zn mineral exploration. This paper contributes to our comprehension of the ore-controlling structures, fluid inclusions, and C–H–O–S–Pb isotope geochemistry of Pb–Zn deposits in this region. These deposits are generally hosted by carbonates and controlled by fractures. The principal homogenization temperatures of quart- and calcite-hosted inclusions ranged predominantly between 120 and 220 °C, with salinities varying from 6 to 16 wt.% NaCl equivalent. The Pb isotope compositions of the ore deposits are comparable to those of Cenozoic volcanic rocks in the region but differ significantly from those of the host rocks, indicating that the Pb within these deposits was derived from the mantle. The C, O, and S isotope compositions of samples exhibit a bimodal distribution based on whether they were derived from magma or host rocks, implying that magma-derived fluids underwent an isotopic exchange with the host rocks. The H-O isotope compositions of samples also indicate that ore-forming fluids were originally magmatic but were depleted by combining with meteoric water. These findings are also supported by variations in fluid inclusion homogenization temperatures and salinities. Taken together, these findings suggest that the Pb–Zn deposits of the Tuotuohe region developed from magma to hydrothermal fluids at medium–low temperatures.

show abstract

Section: H and O Isotope Compositionsmentioning

confidence: 73%

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

2023

View full text Add to dashboard Cite

show abstract

“…Studying sporopollen fossils helps to know about the parent plant through examination of disseminated spore pollens preserved in the deposit. It is also useful for deducing the vegetation law and environmental feedback during this geological epoch [22] . Due to their widespread distribution and high stability in the stratum, rare earth elements are commonly employed in environmental and geological research, primarily as indicators and as tracers in petrogenesis, environmental pollution, and determination of the origin of the deposit among others.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Phaeozem Formation from the Fluvial Parent Material

Guanxin

Yan

Sun

et al. 2022

Preprint

View full text Add to dashboard Cite

The formation and evolution of phaeozems have always been an area of interest because the phaeozems play an important role in two regions dubbed as "European Bread Basket" and "Northeast China Storehouse." As the phaeozems contain a large proportion of parent materials and are sensitive to human intervention, their formation and evolution have been restricted. Due to the homogeneity of loess parent material, there has been extensive research on the formation of surface phaeozems from the loess parent material. However, phaeozems developed from key fluvial parent material have so far received little attention. Therefore, key information on the formation of phaeozems is missing. In this context, this study applies geochemical tests to determine rare earth elements and major and trace elements in the deep phaeozem layer from the Arongqi borehole in the phaeozems of Northeastern China. Further, the sporopollen fossil tests were conducted in the HT-1-4-2 borehole, and the distribution characteristics of the deep phaeozem layer were analyzed using geostatistics. The results from this study indicate that rare earth data from phaeozems in Arongqi's deep layer shows a comparatively high total concentration of rare earth elements, with a mean value of 141.45 mg.kg− 1. The chondrite normalization curve demonstrates that the distribution of light rare earth elements shows a positive slope. Further, Eu shows a trend with a slight negative anomaly, while Ce shows a trend with an evident negative anomaly. Ce > -0.1 (mean value 3.9) indicates a reducing environment with hypoxia. The distribution of rare earth elements indicates that phaeozems contain transportable parent materials with trace elements Th/U > 2 (mean value 2.88), Sr/Ba < 0.6 (mean value 0.38), 0 < Rb/Sr < 0.6 (mean value 0.26), Sr /Cu > 10 (mean value 30.98), and climate index at mean value of 0.23. The presence of trace elements indicated freshwater habitats and a dry-hot to semi-dry-hot climate. The sporopollen fossils are mainly comprised of shrubs, coniferous forests, and terrestrial herbs. The presence of Ephedra and Polygonaceae indicates that the environment was hot and arid at that time. Moreover, the presence of several ferns observed in the vertical profile indicates an intermittent warm and humid climate between droughts. Thus, it can be concluded that the deep phaeozems in Arongqi developed in the floodplains of Arun River under the dry-hot-semi-dry-hot climatic conditions.

show abstract

Karst-hosted Mississippi Valley-type Pb–Zn mineralization in fold-thrust systems: a case study of the Changdong deposit in the Sanjiang Belt, China

et al. 2022

View full text Add to dashboard Cite

Palynological constraints on the age of the Mississippi Valley-type Changdong Pb-Zn deposit, Sanjiang belt, West China

Cited by 10 publications

References 61 publications

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

Insights into the Phaeozem Formation from the Fluvial Parent Material

Karst-hosted Mississippi Valley-type Pb–Zn mineralization in fold-thrust systems: a case study of the Changdong deposit in the Sanjiang Belt, China

Contact Info

Product

Resources

About