🔥 变质岩：高温高压下的“变形记”🔥 Metamorphic Rock: Transformed by Heat and Pressure
上一片里，松散碎屑被压成沉积岩，故事结束了吗？把它埋到地下深处，盖上高温、夹上高压，岩石还会“变身”。🌍 蓝色星球向导打开变身桑拿房，主角是一块叫灰灰的石灰岩。Last time, loose debris was squeezed into sedimentary rock — end of story? Bury it deep underground, add heat and pressure, and rock transforms. 🌍 Your blue-planet guide opens the transformation sauna, starring Gray the limestone.
第 1 步：进桑拿房——高温加高压Step 1: Into the sauna — heat plus pressure
石灰岩走进桑拿房之前，和走出来之后，哪里不一样？What changes when limestone walks out of the sauna?
左边：灰扑扑的石灰岩，一身贝壳碎屑。中间：红色热浪裹住它，上下两只大手一起挤压。右边：闪闪发光的大理岩登场！成分还是碳酸钙，一点没变，变的是更致密的模样。Left: dull gray limestone, full of shell bits. Middle: red heat waves wrap it while two giant hands squeeze from above and below. Right: gleaming marble steps out! Still calcium carbonate inside — only its look and texture changed.
成分一点没变，那“变”的到底是什么？If the ingredients never change, what exactly transforms?
第 2 步：排成条纹——结构变了Step 2: Lined up in stripes — structure changes
高压像一把梳子，把矿物一颗颗梳成条纹，这就是片麻岩的招牌花纹。记住口诀：成分不变，结构变——条带越分明，变质程度越高。Pressure works like a comb, lining minerals up into stripes — the signature look of gneiss. Remember: same ingredients, new structure — the sharper the stripes, the stronger the metamorphism.
地下哪儿来的高温高压？两种变身房见分晓。Where do heat and pressure come from? Two transformation rooms await.
第 3 步：两种变身房——接触与区域Step 3: Two transformation rooms — contact and regional
岩浆路过，把身边一小圈岩石“烤”变了，这叫接触变质。板块相撞，整片高山一起被挤被烤、岩层弯成褶皱，这叫区域变质——喜马拉雅就是它的杰作。Magma passing by toasts a small ring of nearby rock — contact metamorphism. Plates colliding squeeze and bake whole mountain ranges, bending layers into folds — regional metamorphism, the force behind the Himalayas.
🎮 温压实验室：亲手变一块岩石（30 秒）🎮 Heat-Pressure Lab: transform a rock yourself (30 seconds)
道理讲完了。先拖温度和压力，把石灰岩变成大理岩；再过 3 关变身考题。Theory done. Drag temperature and pressure to turn limestone into marble; then clear 3 transformation quizzes.
一句话记住它：变质岩 = 老岩石被高温高压改造，成分不变、结构变；小火烤是接触，大山挤是区域。Remember it in one line: metamorphic rock = old rock remade by heat and pressure — same ingredients, new structure; small-scale baking is contact, mountain-scale squeezing is regional.
石灰岩 → 大理岩、页岩 → 板岩、花岗岩 → 片麻岩，配对记牢Limestone → marble, shale → slate, granite → gneiss — know the pairs条带越分明，变质程度越高Sharper stripes mean stronger metamorphism岩浆烤身边是接触变质，板块挤出高山褶皱是区域变质Magma baking its neighbors is contact; plates squeezing up folded ranges is regional
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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