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专栏 | 南京地理:雨花石是远方的来客 雨花台上雨花石

  • 2026-05-02 01:20:56
专栏 | 南京地理:雨花石是远方的来客 雨花台上雨花石

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在饱赏雨花台自然景色的同时,人们往往会发出各种各样的疑问:这些光滑美丽、巧夺天工的石子为什么都是光溜溜的呢?它们是从哪里来的呢?根据地质学的研究证明,这些石子原来都是大块的岩石,分布在长江流域的南京以上地区,经过风化剥蚀,成为带棱角状的大小不等的碎块,然后经过流水的搬运作用,通过千沟万壑,转运到长江。在滔滔大江的底部,流水的作用使它不断翻滚转动,并和河底岩石撞击,同时石块之间也在互相磨擦,长江简直就象一台巨大的“球磨机”把那些碎石的棱角都磨光了,变为光溜溜的砾石。今天在宜昌以上的长江上游及其支流,如川江、金沙江、大渡河、嘉陵江等河床底部还可以看到“球磨机”的作用仍在继续进行。所以,雨花台砾石层中的雨花石,绝不是“秦淮世家,”也不是南京的“土著,”而是远方的“来客。”它们中的绝大多数都是经过大大小小的溪沟,千里迢迢,辗转翻腾,最后由于河床坡度变小,流速变缓,才在雨花台沉积下来“安家落户”的。类似雨花台这样的砾石层,在长江两岸许多地方,如菊花台、西善桥、板桥、六合一带,也都可以看到。从雨花台砾石层的成分分析,以坚硬的石英为最多,其它如石灰岩、火成岩、页岩等相对比较松软的成分都是很少的。这也说明它是经过长途跋涉,大浪淘沙,不坚定的成分在搬运途中都被分解为更细的砂粒和泥土了。

此外,我们还曾在雨花台砾石层中找到一块含有鲢科化石的硅化灰岩砾石,鲢类是一种浅海的单细胞动物,属于原生动物有孔虫亚纲中的一个目。个体很小,大者不过三厘米,小者不及一毫米。外形常呈纺锤形、圆球形等。含有这种化石的硅化灰岩地层,在长江流域只有在安徽省贵池以以上才有,这就证明这个砾石搬运的途程至少也在二百五十公里以上了。此外近年还有人在雨花台砾石层中找到了马鞍石。一般认为马鞍石是嵌在冰川底部的、已经磨圆了的砾石,在冰川运动过程中,受到了缓慢的压力作用发生了塑变,形成了马鞍形。由于这种砾石的发现,所以便有人推论,雨花台砾石层中有一些砾石是“冰山上的来客,”它们是冰川作用的产物,以后经过流水的搬运才参加到“移民”的行列中来到了雨花台。由此可见,雨花台砾石层砾石的“身世”是颇为复杂的。

但是,为什么在现在南京附近的长江里,就见不到像雨花台那样的砾石呢?在下关、燕子矶的江边河滩上,为什么多是细砂,粉砂和少量的粘土呢?这除了说明古代长江上游两侧的地质情况和今天也许有所不同以外,还说明今天长江的水流条件和古代也不一样。下关长江的平均水位为5.4米,与吴淞口零点之间,只有不到 6米的落差,河床纵向坡度约为1:40000。也就是说在40000米的距离内,高度才只升高一米,这样平缓的坡度,流速当然也就缓慢了,夏季平均为1.1—1.5米/秒。从南京镇江之间河床沉积物样品的分析来看,可以知道现代河床沉积物,砂质是主要的,含量在90%以上,粒径多在2毫米以下,在河床下部被江水拽动跳跃,推移前进;大于2毫米的颗粒,只能在江底滚动,而且为数很少,一般在3%以下,根据现在雨花石的大小来看,沉积雨花台砾石层时的长江流速肯定要比现在大得多。此外,当我们观察少数几个砾石时,好像杂乱无章,但是如果对大量砾石的排列方位加以测量,就可以排除偶然性,找出它的规律性。例如通过对雨花台砾石扁平面(稳定面)进行的测量和统计,发现扁平砾石多向西南方向倾斜,倾角在25°—30°之间。因为河床中沉积的砾石,多是逆流向倾斜,所以当时的长江可以推知是从西南方向流来的。同时,流速越快,倾角越大,根据现在雨花台砾石和它倾角的大小来看,当时要搬运雨花台这样的砂砾层,流速应当在2—2.5米/秒左右,那也就是说流速要比现在快约一倍。可见,当时的长江比之今天还要波涛汹涌。

《南京山水地质》1979年出版的一本小书。

《南京山水地质》是一本综合介绍南京地质、地理、历史和名胜古迹的通俗科学书籍。本书以地质学原理为基础,结合地理和历史知识,对南京的名胜古迹、民间传说和神话进行解释和阐述。书中探讨了宁镇山脉、长江南京段、秦淮河的形成时代,雨花石的来源,以及玄武湖和莫愁湖的形成等问题,并纠正了历史资料中的一些错误。本书既可作为地质科普读物,也可作为旅游指南,文字通俗精练,还引用了古文诗词作为地质或历史变迁的佐证。本书由多位专家参与编写,殷维翰主审编定,并得到了南京大学、南京地质矿产研究所等单位的大力支持。这本书是我外公收藏的,他是一位水利工程师,他对我读书和学习都有很深的影响。

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  1. CONNECT:[ UseTime:0.000430s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000529s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000388s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008164s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000759s ]
  6. SELECT * FROM `set` [ RunTime:0.001380s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 515627 LIMIT 1 [ RunTime:0.000401s ]
  9. UPDATE `article` SET `lasttime` = 1777767065 WHERE `id` = 515627 [ RunTime:0.001303s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 515627 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001434s ]
  12. SELECT * FROM `article` WHERE `id` > 515627 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002729s ]
  13. SELECT * FROM `article` WHERE `id` < 515627 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005677s ]
  14. SELECT * FROM `article` WHERE `id` < 515627 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030263s ]
  15. SELECT * FROM `article` WHERE `id` < 515627 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013291s ]
0.147244s