2.5亿年前陆地生命大灭绝，“主犯”是它？
<div class="wx_rich_media_content" id="jsWxContainer"><p style='margin-bottom: 0em; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; text-align: justify;'><span style='font-family: 微软雅黑, "Microsoft YaHei"; font-size: 15px; color: rgb(34, 34, 34); letter-spacing: 0.544px;'>约2.5亿年前，地球上发生了一次最大规模的生命灭绝事件，超过70%的陆地生物和90%的海洋生物消失。中国科学技术大学沈延安教授课题组最新研究认为，</span><span style='font-family: 微软雅黑, "Microsoft YaHei"; font-size: 15px; letter-spacing: 0.544px; outline: 0px; max-width: 100%; color: rgb(123, 12, 0); visibility: visible; box-sizing: border-box !important;'><strong style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'>当时西伯利亚“超级火山”把巨量二氧化硫喷入大气，导致地球表层遭受硫酸型酸雨腐蚀等灾害，这可能是陆地生命大灭绝的主要原因。</strong></span></p><section data-role="paragraph"><p style='outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'><br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'></span></p><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'>地球历史上曾发生5次大灭绝，约2.5亿年前二叠纪末的第3次最惨烈。海洋中的三叶虫、棘鱼、古珊瑚等灭绝，陆地上大部分动物和昆虫灭绝，植物的大量灭亡使该时期的煤层缺失。这次生命大灭绝的原因和机制，一直是学界关注的重大课题。<br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'><br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'></span></section><p style='margin-bottom: 24px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span class="wxart_image" wx-style='display:inline-block;margin: 0px auto;padding: 0px;outline: currentcolor none 0px;box-sizing: border-box !important;overflow-wrap: break-word !important;vertical-align: top;height: auto !important;border-width: 0px;border-style: initial;border-color: initial;display: block;visibility: visible !important;width: 677px;'></span><span style='outline: 0px; max-width: 100%; color: rgb(136, 136, 136); visibility: visible; font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px; box-sizing: border-box !important;'>二叠纪末灭绝的藤本植物单网羊齿化石。（沈延安课题组供图）</span></p><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'>沈延安课题组和国外研究者合作，对澳大利亚悉尼盆地二叠纪到三叠纪地层进行研究。通过对长1000多米的地下钻孔样品和相关地层进行测量分析，<strong style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'><span style='outline: 0px; max-width: 100%; color: rgb(123, 12, 0); visibility: visible; box-sizing: border-box !important;'>研究者测定了陆地生物在悉尼盆地灭绝的层位，由此确定了它们的灭绝时间。</span></strong><br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'><br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'></span></section><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'>进一步对相关地层的黄铁矿进行高精度测试发现，在陆地生物灭绝前后，黄铁矿的硫同位素含量基本一致，唯独在灭绝期显著降低。<br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'><br style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'></span></section><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; visibility: visible; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'><span style='outline: 0px; max-width: 100%; color: rgb(123, 12, 0); visibility: visible; box-sizing: border-box !important;'><strong style='outline: 0px; max-width: 100%; visibility: visible; box-sizing: border-box !important;'>“我们研究发现，硫同位素的这种异常，与当时悉尼盆地湖水中的硫酸盐浓度急剧升高有关。</strong></span>”沈延安课题组李梦涵博士说，这些硫酸盐来自大气沉降，源于西伯利亚“超级火山”喷发。<br style='outline: 0px; max-width: 100%; box-sizing: border-box !important;'><br style='outline: 0px; max-width: 100%; box-sizing: border-box !important;'></span></section><p style='margin-bottom: 24px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span class="wxart_image" wx-style='display:inline-block;margin: 0px auto;padding: 0px;outline: currentcolor none 0px;box-sizing: border-box !important;overflow-wrap: break-word !important;vertical-align: top;height: auto !important;border-width: 0px;border-style: initial;border-color: initial;display: block;visibility: visible !important;width: 677px;'></span><span style='outline: 0px; max-width: 100%; color: rgb(136, 136, 136); font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px; box-sizing: border-box !important;'>澳大利亚悉尼盆地北缘的生物灭绝层位（红线所示）。（沈延安课题组供图）</span></p><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'>西伯利亚“超级火山”从二叠纪末期起持续喷发数十万年，引发地球生态的连锁反应。<strong style='outline: 0px; max-width: 100%; box-sizing: border-box !important;'><span style='outline: 0px; max-width: 100%; color: rgb(123, 12, 0); box-sizing: border-box !important;'>本次研究表明，火山喷发出的二氧化硫转化成硫酸盐气溶胶在全球扩散，形成“硫酸雨”腐蚀地表环境系统，此外还产生“冰室效应”使全球变冷等，导致陆地生命大灭绝。<br style='outline: 0px; max-width: 100%; box-sizing: border-box !important;'><br style='outline: 0px; max-width: 100%; box-sizing: border-box !important;'></span></strong></span></section><section style='outline: 0px; max-width: 100%; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 1.6em; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; box-sizing: border-box !important;'><span style='font-size: 15px;font-family: 微软雅黑, "Microsoft YaHei";'>日前，国际学术期刊《地球与行星科学通讯》发表了该成果。</span></section></section><section style='text-align: right; font-size: 17px; outline: 0px; max-width: 100%; color: rgb(34, 34, 34); letter-spacing: 0.544px; line-height: 1.5em; font-family: -apple-system, BlinkMacSystemFont, Arial, sans-serif; box-sizing: border-box !important;'><span style='outline: 0px; max-width: 100%; color: rgb(84, 84, 84); font-size: 12px; letter-spacing: 0.54px; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, Arial, sans-serif; box-sizing: border-box !important;'>(来源：新华社)</span></section><section style='text-align: center; font-size: 17px; outline: 0px; max-width: 100%; color: rgb(34, 34, 34); letter-spacing: 0.544px; line-height: 1.5em; font-family: -apple-system, BlinkMacSystemFont, Arial, sans-serif; box-sizing: border-box !important;'><span style='outline: 0px; max-width: 100%; color: rgb(84, 84, 84); font-size: 12px; letter-spacing: 0.54px; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, Arial, sans-serif; box-sizing: border-box !important;'><img src="https://www.yewn.cn/data/attachment/forum/202206/16/151047jk8z67kz4sku3s5d.jpg"></span></section></div> 谢谢告知涨知识了 期望更加深度研究 看着挺神奇的事情～ 长知识 谢谢告知涨知识了 谢谢告知涨知识了 地球物理考古学 多谢告知！ 科学研究的重大发现
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