Lianjun Feng

An Improved EA‐IRMS Method Using V 2 O 5 ‐Assisted Combustion for Carbon Isotope Analysis of High‐Temperature and High‐Pressure Metamorphic Graphite

Hongwei Li, Lianjun Feng, Xu Junjie, Lei Zhao

ABSTRACT An improved method was proposed, which addressed the technical challenge of incomplete combustion and conversion of high‐temperature, high‐pressure metamorphic graphite—a chemically stable material for conventional EA‐IRMS method analysis. The method was based on the addition of an efficient oxidant. Using graphite …

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Green‐Synthesized CuO Nanoparticles Combat Tobacco Bacterial Wilt via Pathogen Inhibition, Motility Impairment and Metabolic Dysregulation in Ralstonia solanacearum

Zhenna Mo, Kai Yuan, Zongze Geng, Yuxiang Deng et autres

ABSTRACT The development of a safe and efficient nano‐enabled strategy for managing tobacco bacterial wilt, a devastating agricultural bacterial disease caused by Ralstonia solanacearum , has attracted considerable research interest. Herein, green and environmentally friendly CuONPs were biosynthesized using orange peel extract …

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Microbially Mediated Intracellular Barite Mineralization: Evidence From an Early Ediacaran Microfossil in the Doushantuo Formation of South China

ShiQi Cheng, Lianjun Feng, Yingjie Yang, Xuelei Chu et autres

Abstract Barite serves as a key proxy for reconstructing paleo‐oceanic productivity and chemistry in modern and ancient marine sediments. Although contemporary barite precipitation involves biological mediation, the mechanisms responsible for ancient barite formation remain unclear. Here, we report the first evidence of …

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Extremely cold ocean temperatures in iron formation brine pools of snowball Earth

Kai Lu, Lianjun Feng, Ross N. Mitchell, Maxwell Alexander Lechte et autres

Abstract For the severe low-latitude “snowball Earth” glaciations, glacial deposits occurring on all continents is well-established. However, cold, salty, ice-covered oceans—a salient prediction of snowball Earth—is difficult to establish geologically. Here we demonstrate that anomalously high iron isotope values (δ 56 Fe) …

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Analysis of APOD and FABP7 genes polymorphisms and their association with feed efficiency in Hu sheep

Ziyue Xiao, Deyin Zhang, Yukun Zhang, Dan Xu et autres

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A novel platform for sequential determination of stable carbon isotopes in carbonates and organic carbon from a single sample using wet chemical oxidation and continuous-flow IRMS

Linlin Cui, Xu Wang, Lianjun Feng

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Acid Fractionation Factor of Oxygen Isotopes in Mixed Calcite–Dolomite Samples: Implications for Data Correction

Linlin Cui, Xu Wang, Lianjun Feng, Xiaomei Zhang

ABSTRACT Rationale The conventional method for measuring carbon and oxygen isotopes in carbonates involves the reaction of carbonate minerals with phosphoric acid (PPA) to generate CO 2 , followed by purification and isotopic analysis. During this reaction, a temperature‐dependent oxygen isotope acid …

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Author response for "Acid Fractionation Factor of Oxygen Isotopes in Mixed Calcite-Dolomite Samples: Implications for Data Correction"

Linlin Cui, Xu Wang, Lianjun Feng, Xiaomei Zhang

Author response for "Acid Fractionation Factor of Oxygen Isotopes in Mixed Calcite-Dolomite Samples: Implications for Data Correction"

Linlin Cui, Xu Wang, Lianjun Feng, Xiaomei Zhang

Author response for "Acid Fractionation Factor of Oxygen Isotopes in Mixed Calcite-Dolomite Samples: Implications for Data Correction"

Linlin Cui, Xu Wang, Lianjun Feng, Xiaomei Zhang

The sedimentary environment and enrichment metallogenic regularity of manganese deposits in the Doushantuo Formation within the Chengkou area, Chongqing, China

Luo Xuwen, Haifeng Fan, Long Chen, Hongjie Zhang et autres

锰是国家战略紧缺关键矿产之一，被广泛用于钢铁工业和新能源汽车、新材料等战略新兴产业。近年来，我国在锰矿资源勘查方面取得了显著进展，例如在城口地区探获了高燕和修齐大型锰矿床。尽管前人对扬子北缘城口碳酸锰矿床进行了系统研究，但在沉积环境和矿床成因等核心问题上仍存在较大争议，导致城口锰矿成矿规律尚未得到充分阐明。为了更全面地了解城口锰矿床的沉积环境，本文测定了城口典型锰矿床（高燕、修齐和大渡溪）的氮同位素组成（δ15N）。结果显示，城口锰矿床的N同位素组成（平均值为7.27‰）明显高于同时期海洋（大约5‰），这表明城口次级盆地的氮循环主要以反硝化作用和/或氨的厌氧氧化为主。结合前人对城口锰矿床铁化学组分的分析和草莓状黄铁矿粒径的分析，本文认为锰矿是在氧化还原分层的水柱中沉积形成的，在（次）氧化环境下以锰氧化物的形式沉淀并富集，在缺氧底层水中还原为Mn(II)，并以菱锰矿的形式保存。此外，根据矿石结构和构造（鲕粒结构和叠层石构造）和Sr/Ba值（高燕均值为0.19，修齐均值为0.29，大渡溪均值为0.49），本文发现城口地区高燕锰矿区的古水深最浅，修齐次之，大渡溪相对较深。结合不同锰矿区的吨位，本文指出锰矿形成于高能浅水环境。总体而言，本研究认为氧化还原梯度是控制城口锰矿富集成矿的重要因素，这为城口地区的锰矿找矿勘探提供了新的视角。

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Determination of Oxygen-Isotope Acid Fractionation Factor on Multiple Carbonate Mixtures Using GasBench II Multipurpose Gas Preparation Device Coupled to Isotope Ratio Mass Spectrometry

Linlin Cui, Xu Wang, Lianjun Feng, Xiaomei Zhang

RATIONALE: The conventional method for measuring carbon and oxygen isotopes in carbonates involves the reaction of carbonate minerals with phosphoric acid (PPA) to generate CO 2 , followed by purification and isotopic analysis. During this reaction, a temperature-dependent oxygen isotope acid fractionation …

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