二叠纪末大灭绝为何被称为「大死亡」？
Why is the end-Permian extinction called 'the Great Dying'?
约2.52亿年前的二叠纪末事件造成约90%海洋物种和七成陆地物种消失，是地球史上最严重的大灭绝。可能与西伯利亚大规模火山喷发导致的气候与海洋缺氧有关。
The end-Permian event about 252 million years ago wiped out ~90% of marine species and 70% of terrestrial ones, the worst mass extinction in Earth's history. It may link to Siberian flood-basalt volcanism causing climate shifts and ocean anoxia.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#二叠纪 #大灭绝 #火山
为什么山顶会有化石？
Why are there fossils on mountains?
山顶的化石原本是海底沉积物: 含生物遗骸的泥沙在浅海压实成石灰岩或页岩，后来板块碰撞把地壳褶曲抬升，岩层被推到几千米高。珠峰顶那层石灰岩里能找到海百合茎与腕足类碎屑，它是特提斯洋的浅海沉积；青藏高原更年轻一些的层位里则出露菊石与海相页岩。抬升速率通常只有毫米每年量级，但几千万年累计就是几千米，所以「山上有海洋生物」不是巧合，而是板块构造最直接的一条证据——同一套逻辑也解释了为什么煤系地层里会出现热带植物化石。
Fossils on a summit began as seabed sediment: mud and shells compacted into limestone or shale in a shallow sea, and later plate collision folded and lifted that crust kilometres into the air. The limestone capping Everest preserves crinoid stems and brachiopod debris, laid down in the shallow Tethys ocean, while younger units across the Tibetan plateau expose ammonites and marine shales. Uplift runs only on the order of millimetres a year, but tens of millions of years add up to kilometres, so 'marine fossils on a mountain' is not a coincidence but the plainest evidence for plate tectonics. The same logic explains tropical plant fossils inside coal measures.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#抬升 #沉积岩 #地壳
如何用放射性同位素测定岩石年龄？
How are rock ages measured with radioactive isotopes?
利用某些元素（如铀-铅、钾-氩）按固定半衰期衰变的特点，测岩石中母核与子核的比例即可算出形成年代。不同同位素适用不同时间尺度，铀-铅常用于古老锆石定年。
Some elements like uranium-lead and potassium-argon decay at fixed half-lives; measuring parent-to-daughter ratios in rock gives its formation age. Different isotopes suit different time scales, with U-Pb commonly dating ancient zircons.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#同位素 #半衰期 #定年
显生宙分为哪三个代？
What are the three eras of the Phanerozoic eon?
显生宙从约5.4亿年前至今，分为古生代、中生代和新生代。古生代鱼类与早期陆地植物繁盛，中生代是恐龙时代，新生代则是哺乳动物和人类的时代。
The Phanerozoic, from about 540 million years ago to today, splits into the Paleozoic, Mesozoic, and Cenozoic eras. Fish and early land plants rose in the Paleozoic, dinosaurs ruled the Mesozoic, and mammals and humans rose in the Cenozoic.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#显生宙 #古生代 #新生代
地球历史分为哪几个宙？
What are the eons of Earth's history?
地球46亿年历史分为冥古宙、太古宙、元古宙和显生宙四个宙。前三个宙统称前寒武纪，显生宙则是多细胞生命大量出现的时期。
Earth's 4.6-billion-year history is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three are called the Precambrian, while the Phanerozoic is when abundant multicellular life appeared.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#冥古宙 #太古宙 #显生宙
地球上最早的生命大约出现在何时？
When did life first appear on Earth?
地球最早期生命迹象可追溯到约35亿至38亿年前，以微生物和叠层石等形式存在。它们出现于大气富含二氧化碳、尚无游离氧的太古宙海洋中。
The earliest signs of life on Earth date to roughly 3.5 to 3.8 billion years ago, as microbes and stromatolites. They arose in Archean oceans rich in carbon dioxide but with little free oxygen.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#生命起源 #叠层石 #太古宙
寒武纪大爆发指的是什么？
What does the Cambrian explosion refer to?
约5.4亿年前的寒武纪初期，多细胞动物门类在相对短时间内大量出现，化石记录中突然丰富的硬壳和复杂身体结构即所谓大爆发，标志着显生宙的开始。
In the early Cambrian about 540 million years ago, multicellular animal groups appeared in great numbers over a relatively short time; the sudden abundance of hard shells and complex body plans in the fossil record marks the start of the Phanerozoic Eon.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#寒武纪 #大爆发 #显生宙
地球上最早的生命出现在什么时候？
When did the earliest life appear on Earth?
在格陵兰和澳大利亚的古老岩石中发现了约35亿到38亿年前的微生物迹象（如叠层石和碳同位素异常）。说明生命在地球形成后不久就已出现。
Ancient rocks in Greenland and Australia preserve microbial signs (like stromatolites and carbon-isotope anomalies) about 3.5–3.8 billion years old, suggesting life arose not long after Earth formed.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#生命起源 #叠层石 #太古宙
什么是放射性同位素定年（半衰期）？
What is radiometric dating using half-life?
放射性同位素会按固定速率衰变，半衰期是其中一半原子衰变所需的时间。比较岩石中母核与子核的比例，就能推算出它的形成年代。
Radioactive isotopes decay at a fixed rate; the half-life is the time for half of them to decay. Comparing parent and daughter isotopes in a rock lets scientists calculate its age.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#放射性定年 #半衰期 #同位素
什么是寒武纪大爆发？
What was the Cambrian explosion?
寒武纪大爆发发生在约5.4亿年前的寒武纪早期，短时间内出现了绝大多数动物门类，海洋生物形态快速多样化。它留下了以澄江生物群为代表的丰富化石记录。
The Cambrian explosion, about 540 million years ago, saw most major animal groups appear in a geologically short span as marine life diversified rapidly. It left rich fossil records such as the Chengjiang biota.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#寒武纪 #大爆发 #动物门类
什么是显生宙、元古宙和太古宙？
What are the Phanerozoic, Proterozoic and Archean eons?
太古宙（约40亿到25亿年前）是最早、生命稀少的时期；元古宙延续到约5.4亿年前，出现藻类和早期多细胞生物；显生宙从寒武纪至今，以丰富可见生命为特征。
The Archean (~4.0–2.5 billion years ago) is the earliest, life-sparse eon; the Proterozoic ran to about 540 million years ago with algae and early multicellular life; the Phanerozoic from the Cambrian to now is marked by abundant visible life.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#显生宙 #元古宙 #太古宙
为什么有些岩石看起来「很年轻」却测出很老的年龄？
Why do some rocks look young yet date very old?
同位素测年测的是矿物最后结晶或变质重置的时间，而非外表。若岩石经历了后期热事件重设了「时钟」，或外貌因风化改变，就会出现年龄与外观不符的情况。
Isotopic dating measures when minerals last crystallized or were reset by metamorphism, not their looks. If rock later underwent heating that reset the 'clock', or weathering changed appearance, age and look can mismatch.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#测年 #重置 #热事件
锆石U-Pb定年为何被视为火成岩年代学的基准方法?它的两条衰变链如何互相检验体系封闭性?
Why is zircon U-Pb dating regarded as the benchmark method for igneous geochronology, and how do its two decay chains cross-check system closure?
锆石晶格容纳U4+却排斥Pb2+,初始普通铅近乎为零,子体几乎全为放射成因,误差源极少。238U→206Pb与235U→207Pb两链并行计时,若两组年龄在谐和图上重合,即证明晶体自结晶以来未丢失母子体元素;加之Pb封闭温度高于900°C,锆石即使经历后期变质仍能保存原始结晶年龄。
Zircon lattices admit U4+ yet exclude Pb2+, leaving near-zero initial common lead and hence few error sources. The parallel clocks of 238U→206Pb and 235U→207Pb are tested on concordia: coincident dual ages certify that parent-daughter elements were never lost since crystallization. With Pb closure above 900 °C, zircon retains its primary crystallization age even through later metamorphism.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Dickin, A. P., Radiogenic Isotope Geology (2nd ed.), Cambridge University Press, 2005
Alan P. Dickin, Radiogenic Isotope Geology, 2nd ed., Cambridge University Press, 2005
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL39650928W：Radiogenic Isotope Geo
#U-Pb定年 #同位素地质年代学
为什么 U-Pb 法能在锆石上获得高精度年龄,而 K-Ar 法更适于测定火山岩的喷发时代?
Why can U-Pb dating of zircon yield high-precision ages, whereas the K-Ar method is better suited to dating eruption times of volcanic rocks?
锆石晶格容纳铀却几乎排斥铅,初始铅可近似为零,且 238U→206Pb 与 235U→207Pb 两套衰变链可相互校验,谐和图解因此能识别并剔除后期铅丢失的样品。K-Ar 法依赖含钾矿物中氩的积累,氩封闭温度较低,火山岩的快速冷却恰好封存了喷发时刻的同位素信息。于是前者适合古老地体与碎屑锆石源区研究,后者常用于年轻火山事件的定年。
Zircon accepts uranium into its lattice but rejects lead almost completely, so initial lead can be treated as zero; the two decay chains 238U-to-206Pb and 235U-to-207Pb also cross-check each other, letting concordia diagrams flag samples that suffered later lead loss. K-Ar dating instead relies on argon accumulated in potassium-bearing minerals; with a low closure temperature, rapid cooling of volcanic rock seals in the isotopic signature of eruption time. U-Pb therefore suits ancient terranes and detrital provenance work, while K-Ar commonly dates young volcanic events.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
G. Faure 与 T. M. Mensing 合著《Isotopes: Principles and Applications》第三版,Wiley
G. Faure and T. M. Mensing, Isotopes: Principles and Applications, 3rd ed., Wiley
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780471384373 (2007)
#同位素定年 #地质年代学
什么是地层“金钉子”（GSSP）？年代地层界线为什么优先用化石标志而非岩性来定义？
What is a Global Boundary Stratotype Section and Point (GSSP, "golden spike"), and why are chronostratigraphic boundaries defined by fossil markers rather than by lithology?
GSSP即全球界线层型剖面与点位：国际地层委员会在一套连续出露的地层中指定物理点位，作为阶等年代地层单位底界的全球标准。岩性界面常常穿时——同期不同盆地可分别沉积砂岩或灰岩，难以全球对比；而标志种的首现近似等时的“时间面”。因此金钉子以特定化石首现为主标志，辅以地球化学事件，保证地质年代表全球统一。
A GSSP is a globally agreed physical point in a continuous, well-exposed section, designated by the International Commission on Stratigraphy as the standard base of a chronostratigraphic unit such as a stage. Lithological boundaries are often diachronous: sandstone and limestone may accumulate simultaneously in different basins, so facies cannot be correlated worldwide. The first appearance of a marker species, by contrast, approximates an isochronous time plane. Golden spikes therefore rely chiefly on fossil first appearances, aided by geochemical events.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Gradstein, Ogg, Schmitz & Ogg 主编，“The Geologic Time Scale 2020”，Elsevier，2020
Gradstein, Ogg, Schmitz & Ogg (eds.), "The Geologic Time Scale 2020", Elsevier, 2020
#金钉子 #GSSP #年代地层
白垩纪末灭绝事件的可能原因是什么？
What is the likely cause of the end-Cretaceous extinction?
主流证据指向一颗小行星撞击（墨西哥尤卡坦的希克苏鲁伯陨石坑），引发全球尘埃遮日、气候骤冷与酸雨。这导致非鸟恐龙灭绝，并为哺乳动物崛起让路。
Leading evidence points to an asteroid impact (the Chicxulub crater in Mexico's Yucatan) that threw up global dust, chilling climate and acid rain. It killed non-avian dinosaurs and opened the way for mammals.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#白垩纪 #撞击 #陨石坑
什么是化石？
What is a fossil?
化石是保存在岩石中的古代生物遗体、遗迹或印痕，如贝壳、骨骼和脚印。它帮助科学家重建远古环境和生命演化历程。
A fossil is the preserved remains, traces, or impressions of ancient organisms in rock, such as shells, bones, and footprints. Fossils help scientists reconstruct past environments and the history of life.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#化石 #遗迹 #演化
恐龙是什么时候灭绝的？
When did the dinosaurs go extinct?
非鸟类恐龙在约6600万年前的白垩纪-古近纪界线大灭绝中消失，很可能由小行星撞击和大规模火山活动共同触发。鸟类是恐龙的直系后代，延续至今。
Non-avian dinosaurs vanished about 66 million years ago at the Cretaceous–Paleogene boundary, likely triggered by an asteroid impact together with massive volcanism. Birds are their direct descendants and survive today.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#恐龙灭绝 #K-Pg界线 #小行星
「代」和「纪」哪个时间更长？
Which is longer in time, an 'era' or a 'period'?
在地质年代表中，「代」比「纪」更大一级：一个代包含若干个纪。例如显生宙分为古生代、中生代和新生代，每个代又细分为多个纪。
In the geologic time scale, an era is a larger unit than a period: one era contains several periods. For example, the Phanerozoic Eon is divided into Paleozoic, Mesozoic and Cenozoic eras, each further split into periods.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#代 #纪 #层级
地质年代是怎么划分的？
How are geologic time periods divided?
地质学家把地球约46亿年历史按重大事件分成宙、代、纪、世等层级。划分依据包括化石变化、地层界限和同位素测年，越近的时间单位划分越细。
Geologists divide Earth's ~4.6 billion years into eons, eras, periods and epochs by major events. The basis includes fossil changes, stratigraphic boundaries and isotopic dating, with finer divisions nearer the present.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#地质年代 #纪 #测年
恐龙生活在哪个地质年代？
In which geologic period did dinosaurs live?
恐龙主要繁盛于中生代，包括三叠纪、侏罗纪和白垩纪，约从2.5亿年前到6600万年前。白垩纪末的一次大灭绝结束了非鸟恐龙的统治。
Dinosaurs thrived mainly in the Mesozoic Era, spanning the Triassic, Jurassic and Cretaceous, from about 250 to 66 million years ago. A mass extinction at the Cretaceous end ended non-avian dinosaur dominance.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Wicander & Monroe,《Historical Geology》Cengage 多版
R. Wicander and J. S. Monroe, Historical Geology, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL79786W：Historical geology（按标题+作者
#恐龙 #中生代 #白垩纪