第一个岩石岩石循环是什么?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 04 - 13 - t06:41:10z //www.hoelymoley.com/feeds/question/4577 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/4577 22 第一个岩石岩石循环是什么? Lucian09474 //www.hoelymoley.com/users/1034 2015 - 03 - 24 - t05:55:44z 2022 - 01 - 03 - t12:15:58z < p >我是一名本科学生,但我是一个高中教师,和一个学生问我。试图解释岩石循环”如果一个岩石变成另先“我的直觉告诉我可能是火成岩(地球的地质历史。)资源网络有不同的看法。我在我的假设吗? < / p > //www.hoelymoley.com/questions/4577/-/4579 # 4579 22 Gimelist回答的第一个岩石岩石循环是什么? Gimelist //www.hoelymoley.com/users/725 2015 - 03 - 24 - t08:04:10z 2015 - 03 - 24 - t08:04:10z < blockquote > < p >是第一个< / p > < /引用> < p >这是一个非常困难的问题。最简单的答案确实是火成岩。原因:< / p > < ol > <李> < p >沉积岩(岩石循环的感觉)来自预先存在的火成岩和变质岩,所以你需要有第一个吃螃蟹的人。李李< / p > < / > < > < p >变质岩,根据定义,岩石形成于其他种类的岩石(火成岩和变质)。李李< / p > < / > < > < p >火成岩形成其他岩石融化的。现在这里是抓——你认为“其他岩石”?地球上第一个火成岩(或确切地说——proto-Earth)可能影响融化形成的各种小型行星相互撞击,合并形成了地球。这些星子形成的冷凝的气体从太阳星云,在地球还存在,在岩石循环开始之前。< / p > < /李> < / ol > < p >是的,火成岩在这里。岩石(或材料,如果你愿意),之前存在的火成岩不适合传统的火成岩/沉积变质的定义。< / p > < p >然而,注意,岩石循环的规则并不是写在石头(双关语)。蒸发岩呢?岩石如岩盐和石膏床表面形式在地球上,和他们的选民并不是直接来自火成岩和变质岩。关于砂岩风化形成的砂岩前? What about igneous rocks that form by partial melting of metamorphic rocks, and then melt again without ever reaching the surface to become sedimentary rocks? And my favourite one: pyroclastic rocks. Are they sedimentary or igneous? One textbook quips that they're igneous going up, and sedimentary going down.

 //www.hoelymoley.com/questions/4577/-/4580 # 4580 7 弗雷德回答的第一个岩石岩石循环是什么? 弗雷德 //www.hoelymoley.com/users/2470 2015 - 03 - 24 - t08:34:27z 2015 - 03 - 25 - t00:40:23z < p >我想这也取决于我们走多远。< / p >

The Earth is a rocky planet formed by the accretion/agglomeration of cosmic dust and ice. One might argue that the first rock of Earth was an agglomeration, and once a critical mass had been reached, the agglomerated core heated and began to melt creating igneous rock, assisted by the heat of bombardment from more cosmic rocks and of radioactive decay.

 //www.hoelymoley.com/questions/4577/-/4585 # 4585 15 回答由马克Rovetta岩石循环的第一个摇滚是什么? 马克Rovetta //www.hoelymoley.com/users/178 2015 - 03 - 25 - t03:18:47z 2019 - 12 - 03 - t20:15:06z < p >地球之前就早已存在有地壳岩石或岩石循环”。< / p >

The idea of the "rock cycle" has prerequisites to even be meaningful. These include:

  1. The existence of a crust (both a continental and oceanic crust actually.)
  2. Plate tectonics
  3. The existence of an atmosphere and ocean.

Without all of these, the concept of the rock cycle (as introduced in textbooks) really is not applicable. (You might suppose there were other 'rock cycles' in the very distant past but that is not what is discussed in undergraduate textbooks.)

The Earth is older than (1) (2) or (3) - so when these preconditions were not in place there was no rock cycle. The three preconditions also did not "turn on" at exactly the same time. It took a long time for the Earth's crust to form (When and how did continental crust form?). Oceans and lakes appeared later (When did oceans form on Earth?). Plate tectonics may have began early (When did plate tectonics begin?).

The point is that the planetary conditions necessary for the rock cycle we see evidence for in the geology of the last billion years or so evolved over much time. Earth was very different in the distant past.

This is the reason why there are no scientists working on the question: "What was the first rock in the rock cycle?" Scientists would like to answer big questions, such as:

  1. When and how did the crust form?
  2. When and how did the oceans and atmosphere form?
  3. When and how did plate tectonics begin?
 //www.hoelymoley.com/questions/4577/-/6795 # 6795 3 由戈登斯坦格回答第一个岩石岩石循环是什么? 戈登斯坦格 //www.hoelymoley.com/users/4507 2015 - 10 - 27 - t06:25:12z 2015 - 10 - 27 - t06:25:12z < p >地球有46亿年的历史,涉及proto-planet碰撞,陨石轰击在阴间的时代,和早期熔融阶段当大规模分化。我们有充分的理由相信最早的岩石,地球是由吸积,陨石成分。其中很多是无情的包含的陨石球粒陨石,即millimetre-sized球形液滴的flash融化超过1500摄氏度,很可能被“煮熟”靠近超新星爆炸。这些陨石球粒可能形成一个或二百万年前被纳入落基陨石,我们现在找到他们。因此,我将提名这些是第一个已知的岩石地面岩石循环。< / p > //www.hoelymoley.com/questions/4577/-/23334 # 23334 3 罗德尼·F·塔克先生回答的第一个岩石岩石循环是什么? 罗德尼·F·塔克先生 //www.hoelymoley.com/users/26087 2021 - 12 - 21 - t06:54:42z 2021 - 12 - 21 - t06:54:42z < p >答案很简单:地球的太阳作为一个熔融的岩浆球。时代才酷,最终开发出一种地壳岩浆冷却。So the first "rocks" on Earth must have been "igneous" (developed from a firey or molten state). In Barberton South Africa, the Barberton Greenstone Belt (BGB) comprises a basal lava-rich unit (Onverwacht Group) with Komatiite lavas (primitive, soda-rich, high temperature), followed by the Fig Tree and Moodies (mainly sedimentary and volcanic) groups. The question is "What were the komatiite lavas extruded out onto? Today we see a "basement" of granite-type rocks that appear intrusive, and therefore "younger". This was probably due to remobilization and/or epirogenesis (uplifting of lighter granitic rocks into denser more mafic (Mg, Fe-rich) lavas). Nevertheless, it is more logical to propose that these early lavas would have been extruded onto a solid surface. The very early earth comprised elements from H to Fe only, and Fe (iron) naturally accumulated in the denser core, leaving the classic granite rocks (H, N, O, Al, Si, Na, K etc.) to form the first crust. Geologists speak scantly about the Hadean Era as it was essentially devoid of solid rock. That only came about in the Archaean when rocks started to form. Rod Tucker (BSc(Eng), MSc, FGSSA, FSAIMM)

 //www.hoelymoley.com/questions/4577/-/23356 # 23356 1 norman_h回答的第一个岩石岩石循环是什么? norman_h //www.hoelymoley.com/users/6463 2022 - 01 - 03 - t12:15:58z 2022 - 01 - 03 - t12:15:58z < p >地球凝聚从气体变成液体变成固体。< / p >

Rocks are assumed to be solids and not a fluid part of a melt.

Bowens Reaction Series implies that the first rocks on earth would have been Olivine Polymorphs.

MgSiO3-perovskite and MgO (periclase) are likely candidates from observations at the Earths Moho.

As far as the "rock cycle" goes; these first rocks would be classified as igneous.
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