CO₂ Release Driven by the Combination of Sulfide Oxidation and Carbonate Dissolution in the Upper Changjiang River: Effect of Erosion and Lithology on Chemical Weathering

Abstract

Reconstructions of the ocean basins indicate the CO 2 release from volcanism is relatively constant over the Cenozoic, however, a long-term progressive decrease in atmospheric CO 2 (i.e., cooling) has been observed during the same period (Misra & Froelich, 2012;Muller et al., 2008;Zachos et al., 2001). Because of the increasing marine 87 Sr/ 86 Sr ratios and the positive link between silicate weathering flux and erosion, the "uplift-weathering" hypothesis attributes the long-term cooling to the uplift of the Tibetan plateau and enhanced silicate weathering since the Miocene epoch (

Anthropogenic Gadolinium Accumulation and Rare Earth Element Anomalies of the Typical Urban River, North China: Evidence from the Three-Dimensional Tracing System

“…Lanthanum (La, Z = 57) to lutetium (Lu, Z = 71) together with the addition of yttrium (Y, Z = 39) in the periodic table are regarded as rare earth elements (REEs). − Considering their essential status in large amounts of high-tech processes and industrial products (i.e., advanced weapon systems, contrast agents in the medical imaging field, super capacitors and conductors, etc. ), the application of REEs in economical and industrial activities has dramatically increased, especially in the past two decades. ,− This situation leads to excessive REE discharge into adjacent urban rivers and poses a threat to the environment, which takes great scientific concern. ,− …”